Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000920321 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2016-01-03 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
Schedule of changes in projected benefit obligations	The following tables provide a reconciliation of the changes in the Company’s pension, SERP and OPEB plans' benefit obligations and fair value of assets for 2016 and 2015, a statement of the funded status as of the years ended 2016 and 2015, respectively, and the amounts recognized in the consolidated balance sheets as of the years ended 2016 and 2015 (in thousands).     Pensions   SERPs   OPEBs     2016   2015   2016   2015   2016   2015 Benefit obligation at beginning of year   $ 345,901   $ 365,326   $ 16,998   $ 18,508   $ 1,504   $ 1,789 Plan changes   —   —   1,822   —   —   — Service cost                                                        —   —   —   —   2   2 Interest cost                                                        13,495   13,341   640   656   58   63 Actuarial loss (gain)                                  304   (14,715 )   (531 )   (94 )   60   (274 ) Benefits paid                                                        (19,152 )   (18,051 )   (1,908 )   (2,072 )   (68 )   (76 ) Benefit obligation at end of year   $ 340,548   $ 345,901   $ 17,021   $ 16,998   $ 1,556   $ 1,504
Schedule of changes in fair value of plan assets	The following table provides a reconciliation of the Company’s fair value of plan assets:     Pensions   SERPs   OPEBs     2016   2015   2016   2015   2016   2015 Fair value of plan assets at beginning of year   $ 247,519   $ 267,635   $ —   $ —   $ —   $ — Actual return on plan assets   9,965   (6,610 )   —   —   —   — Employer contributions                                                        11   4,545   1,908   2,072   68   76 Benefits paid                                                        (19,152 )   (18,051 )   (1,908 )   (2,072 )   (68 )   (76 ) Fair value of plan assets at end of year   $ 238,343   $ 247,519   $ —   $ —   $ —   $ —
Schedule of net funded status	The following table shows the funded status at the end of the year:     Pensions   SERPs   OPEBs     2016   2015   2016   2015   2016   2015 Funded status at end of year   $ (102,205 )   $ (98,382 )   $ (17,021 )   $ (16,998 )   $ (1,556 )   $ (1,504 )
Schedule of net periodic benefit cost recognized in accumulated other comprehensive loss	The following table shows amounts recognized in AOCI:   Pensions   SERPs   OPEBs     2016   2015   2016   2015   2016   2015 Net actuarial loss (gain)                                                      $ 119,450   $ 119,712   $ 4,567   $ 5,438   $ (899 )   $ (1,045 ) Prior service cost                                                        —   —   —   —   40   44 Total                                                  $ 119,450   $ 119,712   $ 4,567   $ 5,438   $ (859 )   $ (1,001 )
Schedule of amounts recognized in the balance sheet	The following table shows amounts recognized in the consolidated balance sheets:     Pensions   SERPs   OPEBs     2016   2015   2016   2015   2016   2015 Other current liabilities                                                        $ —   $ —   $ 2,038   $ 1,967   $ 148   $ 130 Other liabilities                                                        102,205   98,382   14,983   15,031   1,408   1,374 Total liabilities                                                              $ 102,205   $ 98,382   $ 17,021   $ 16,998   $ 1,556   $ 1,504
Schedule of net benefit costs	The following table provides components of the net periodic cost for the pension, SERP and OPEB plans for the years ended 2016 and 2015 (in thousands):     For The Years Ended     2016   2015 Service cost   $ 2   $ 2 Interest cost   14,196   14,061 Expected return on plan assets   (19,101 )   (20,976 ) Net amortization and deferral   —   — Recognized net actuarial loss   9,956   8,877 Net periodic expense   $ 5,053   $ 1,964
Schedule of assumptions used in computing net periodic cost and funded status	The assumptions used were as follows:     2016   2015 Discount rate used to calculate net periodic benefit expense   4.00 %   3.75 % Discount rate used to calculate projected benefit obligation   3.75 %   4.00 % Expected long-term rate of return on plan assets   8.00 %   8.00 % Rate of compensation increase   n/a   n/a
Schedule of benefit obligations in excess of fair value of plan assets	The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the Company’s pension plans with accumulated benefit obligations in excess of plan assets were as follows (in thousands):     2016   2015 Projected benefit obligation                                                                              $ 357,569   $ 362,899 Accumulated benefit obligation                                                                              357,569   362,899 Fair value of plan assets                                                                              238,343   247,519
Schedule of expected benefit payments	The estimated pension benefit payments expected to be paid by the pension plans and the estimated SERP and OPEB payments expected to be paid by the Company for the years 2017 through 2021, and in the aggregate for the years 2022 through 2026, are as follows (in thousands):       Pension   SERP   OPEB  2017   $ 18,453   $ 2,076   $ 150 2018   18,743   1,897   145 2019   19,078   1,817   139 2020   19,365   1,733   133 2021   19,650   1,646   127 2022 through 2026   101,161   6,721   540
Schedule of allocation of plan assets	The fair values of the Company’s pension plan assets as of the years ended 2016 and 2015, by asset category are as follows (in thousands):     2016   2015     Level 1   Level 2   Total   Level 1   Level 2   Total     Cash and cash equivalents   $ 7,624   $ —   $ 7,624   $ 12,306   $ —   $ 12,306     Equity   123,352   —   123,352   120,953   —   120,953     Fixed income   15,908   46,280   62,188   12,497   49,993   62,490     Other   —   1,369   1,369   —   1,489   1,489 Total of Level 1 and Level 2 assets   $ 146,884   $ 47,649   $ 194,533   $ 145,756   $ 51,482   $ 197,238                           Investments at Net Asset Value (1)                             Alternative investments           43,810           50,281 Total net assets           $ 238,343           $ 247,519 The range of asset allocations and the target allocations for the pension plan assets were as follows:     2016   2015   Target Equity securities                                                                              52 % 61 %   49 % 62 %   60 % 75 % Fixed income securities   26 % 34 %   29 % 33 %   25 % 35 % Alternative investments and other   5 % 22 %   5 % 22 %   10 % 30 %
Schedule of multiemployer plans	The Company's participation in these plans for the years ended 2016 and 2015 is outlined in the table below: Pension Fund EIN Pension Plan Number Pension Protection Act Reported Status (1) FIP/RP Status (2) Contributions Surcharge imposed Expiration Date of Collective Bargaining Agreement       2016   2015   2016   2015                   (in thousands)     GCC/IBT National Pension Fund 526118568 001 Red   Red Implemented $ 183   $ 219 No 6/30/2019 GCC/IBT National Pension Fund 526118568 001 Red   Red Implemented 177   177 No 2/26/2017 CWA/ITU Negotiated Pension Plan 136212879 001 Red   Red Implemented 228   158 No 3/1/2018           Total contributions $ 588   $ 554     __________________________ (1)  The most recent Pension Protection Act ("PPA") zone status available in 2016 and 2015 is for the plan's year end, not the Company's year end. The zone status is based on information that the Company received from the plan and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded. (2)  The FIP/RP Status column indicates plans for which a financial improvement plan ("FIP") or a rehabilitation plan ("RP") is either pending or has been implemented.