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

Reporting Entity [Axis]

0001412100 (http://www.sec.gov/CIK)

Fair Value Disclosures [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Fair Value Disclosures [Abstract]
Fair value hierarchy of financial assets and financial liabilities measured on a recurring basis	At December 31, 2016 and 2015, we classified our financial instruments measured at fair value on a recurring basis in the following valuation hierarchy: December 31, 2016   Quoted Prices in Active Markets for Identical Assets (Level 1)   Significant Other Observable Inputs (Level 2)   Significant Unobservable Inputs (Level 3)   Total Fair Value AFS fixed maturities                 U.S. treasury bonds   $ 5,413   $ —   $ —   $ 5,413 U.S. agency bonds – mortgage-backed   —   1,716,038   —   1,716,038 U.S. agency bonds – other   —   18,102   —   18,102 Non-U.S. government and supranational bonds   —   29,934   —   29,934 Asset-backed securities   —   220,876   —   220,876 Corporate bonds   —   1,916,205   —   1,916,205 Municipal bonds   —   65,098   —   65,098 Other investments   6,586   —   6,474   13,060 Total   $ 11,999   $ 3,966,253   $ 6,474   $ 3,984,726 As a percentage of total assets   0.2 %   63.4 %   0.1 %   63.7 % December 31, 2015   Quoted Prices in Active Markets for Identical Assets (Level 1)   Significant Other Observable Inputs (Level 2)   Significant Unobservable Inputs (Level 3)   Total Fair Value AFS fixed maturities                 U.S. treasury bonds   $ 6,010   $ —   $ —   $ 6,010 U.S. agency bonds – mortgage-backed   —   1,476,991   —   1,476,991 U.S. agency bonds – other   —   24,311   —   24,311 Non-U.S. government and supranational bonds   —   30,544   —   30,544 Asset-backed securities   —   165,804   —   165,804 Corporate bonds   —   1,739,668   —   1,739,668 Municipal bonds   —   64,760   —   64,760 Other investments   4,905   —   6,907   11,812 Total   $ 10,915   $ 3,502,078   $ 6,907   $ 3,519,900 As a percentage of total assets   0.2 %   61.4 %   0.1 %   61.7 %
Changes in Level 3 for financial instruments measured at fair value on a recurring basis	The following table presents changes in Level 3 of our financial instruments measured at fair value on a recurring basis for the years ended December 31, 2016 and 2015:     For the Year Ended December 31, Other investments:   2016   2015 Balance at beginning of period   $ 6,907   $ 6,581 Total realized gains – included in net realized gains on investment   448   192 Total realized losses – included in net realized gains on investment   —   — Change in total unrealized gains – included in other comprehensive income (loss)   78   373 Change in total unrealized losses – included in other comprehensive income (loss)   —   — Purchases   172   217 Sales and redemptions   (1,131 )   (456 ) Transfers into Level 3   —   — Transfers out of Level 3   —   — Balance at end of period   $ 6,474   $ 6,907 Level 3 gains included in net income attributable to the change in unrealized gains relating to assets held at the reporting date   $ —   $ —
Carrying values of financial instruments not measured at fair value	The following table presents the fair value and carrying value of the financial instruments not measured at fair value:     December 31, 2016   December 31, 2015     Carrying Value   Fair Value   Carrying Value   Fair Value Financial Assets                 HTM – corporate bonds   $ 752,212   $ 766,135   $ 607,843   $ 598,975 Total financial assets   $ 752,212   $ 766,135   $ 607,843   $ 598,975                   Financial Liabilities                 MHLA – 6.625%   $ 110,000   $ 111,452   $ —   $ — MHNC – 7.75%   152,500   164,700   152,500   165,456 MHNB – 8.00%   100,000   101,600   100,000   105,328 MHNA – 8.25%   —   —   107,500   110,424 Total financial liabilities   $ 362,500   $ 377,752   $ 360,000   $ 381,208