v3.3.1.900
Investments - Restricted Cash and Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Restricted Cash and Investments Items [Line Items]    
Restricted cash $ 242,859 $ 284,381
Restricted investments 3,425,585 2,836,962
Restricted cash and investments 3,668,444 3,121,343
Amortized cost 4,181,523 3,390,726
Third party agreements    
Restricted Cash and Investments Items [Line Items]    
Restricted cash 102,837 107,884
Restricted investments 1,067,602 1,014,878
Amortized cost 1,081,202 933,974
Related party agreements    
Restricted Cash and Investments Items [Line Items]    
Restricted cash 139,944 175,817
Restricted investments 1,754,705 1,814,478
Amortized cost 1,781,178 1,769,083
HMT, related party agreements    
Restricted Cash and Investments Items [Line Items]    
Restricted investments 598,975 0
Amortized cost 607,843 0
US state regulatory authorities    
Restricted Cash and Investments Items [Line Items]    
Restricted cash 78 680
Restricted investments 4,303 7,606
Amortized cost $ 4,071 $ 7,269