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Investments - Securities In Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months $ 514,490 $ 2,209,765
12 months or greater 337,668 491,195
Total investment portfolio 852,158 2,700,960
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (4,556) (49,346)
12 months or greater (5,406) (18,494)
Total investment portfolio (9,962) (67,840)
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 22,655 60,548
12 months or greater 0 1,923
Total investment portfolio 22,655 62,471
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (41) (1,467)
12 months or greater 0 (475)
Total investment portfolio (41) (1,942)
Obligations of U.S. states and political subdivisions    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 185,163 417,615
12 months or greater 13,942 37,014
Total investment portfolio 199,105 454,629
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (815) (6,404)
12 months or greater (307) (886)
Total investment portfolio (1,122) (7,290)
Corporate debt securities    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 200,500 1,470,628
12 months or greater 41,424 114,982
Total investment portfolio 241,924 1,585,610
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (2,843) (38,519)
12 months or greater (1,536) (6,251)
Total investment portfolio (4,379) (44,770)
Asset-backed securities    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 20 86,604
12 months or greater 4,102 5,546
Total investment portfolio 4,122 92,150
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (32) (173)
12 months or greater 0 (30)
Total investment portfolio (32) (203)
Residential mortgage-backed securities    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 3,204 35,064
12 months or greater 186,494 209,882
Total investment portfolio 189,698 244,946
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (7) (312)
12 months or greater (3,049) (8,080)
Total investment portfolio (3,056) (8,392)
Commercial mortgage-backed securities    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 84,048 134,488
12 months or greater 38,992 69,927
Total investment portfolio 123,040 204,415
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (632) (2,361)
12 months or greater (348) (1,614)
Total investment portfolio (980) (3,975)
Collateralized loan obligations    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 18,868 0
12 months or greater 52,570 51,750
Total investment portfolio 71,438 51,750
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months (186) 0
12 months or greater (163) (1,148)
Total investment portfolio (349) (1,148)
Debt securities issued by foreign sovereign governments    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months   4,463
12 months or greater   0
Total investment portfolio   4,463
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months   (102)
12 months or greater   0
Total investment portfolio   (102)
Equity securities    
Continuous Unrealized Loss Portion, Fair Value [Abstract]    
Less than 12 months 32 355
12 months or greater 144 171
Total investment portfolio 176 526
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract]    
Less than 12 months 0 (8)
12 months or greater (3) (10)
Total investment portfolio $ (3) $ (18)