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

Reporting Entity [Axis]

0000930420 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
Actuarial Assumptions Used to Determine the Actuarial Present Value of Projected Benefit Obligations	The following table presents the weighted average actuarial assumptions used to determine the actuarial present value of projected benefit obligations at:   DECEMBER 31,   2016   2015 Discount rate 4.00 %   4.00 % Rate of future compensation increase 3.60 %   4.00 %
Actuarial Assumptions Used to Determine Net Periodic Benefit Cost	The following table presents the weighted average actuarial assumptions used to determine net periodic benefit cost for the years ended:   DECEMBER 31,   2016   2015   2014 Discount rate 4.00 %   3.75 %   3.75 % Rate of future compensation increase 4.00 %   4.00 %   4.00 %
Components of Net Periodic Benefit Cost	The following table presents the components of net periodic benefit cost for the years ended (in thousands):   DECEMBER 31,   2016   2015   2014 Service cost $ 1,310   $ 1,323   $ 1,164 Interest cost 453   383   294 Net periodic benefit cost $ 1,763   $ 1,706   $ 1,458 The following represents the components of net periodic post-retirement benefit cost for the year ended December 31 (in thousands):   2014 Service cost $ 174 Interest cost 78 Settlement/curtailment loss 725 Net periodic benefit cost $ 977
Changes in the Benefit Obligation	The following table presents the changes in the benefit obligation for the years ended (in thousands):   DECEMBER 31,   2016   2015 Projected benefit obligation, beginning $ 11,337   $ 10,197 Service cost 1,310   1,323 Interest cost 453   383 Actuarial experience and changes in actuarial assumptions 336   (566 ) Projected benefit obligation, ending $ 13,436   $ 11,337
Projected Annual Benefit Payment	Undiscounted benefit payments by the SERP, which reflect the anticipated future service of participants, expected to be paid are as follows (in thousands):   PROJECTED ANNUAL BENEFIT PAYMENTS 2017 $ — 2018 — 2019 — 2020 — 2021 12,450 2022-2026 — Thereafter 4,864