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Investments - Schedule of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis $ 1,822,890 [1] $ 1,734,683 [2]
Available-for-sale debt securities gross unrealized gain 70,180 [1] 65,017 [2]
Available-for-sale debt securities, gross unrealized loss (4,087) [1] (7,262) [2]
Available-for-sale debt securities, at fair value 1,888,983 [1] 1,792,438 [2]
Available-for-sale equity securities, cost 35,369 36,818
Available-for-sale equity securities, gross unrealized gain 10,667 8,589
Available-for-sale equity securities, gross unrealized loss (100) (513)
Available-for-sale equity securities, at fair value 45,936 44,894
Available-for-sale securities, amortized cost basis 1,858,259 1,771,501
Available-for-sale securities, gross unrealized gain 80,847 73,606
Available-for-sale securities, gross unrealized loss (4,187) (7,775)
Available-for-sale securities, fair value 1,934,919 1,837,332
U.S. Government and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 9,087 10,148
Available-for-sale debt securities gross unrealized gain 311 350
Available-for-sale debt securities, gross unrealized loss (16) (24)
Available-for-sale debt securities, at fair value 9,382 10,474
Foreign Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 132,465 124,274
Available-for-sale debt securities gross unrealized gain 6,752 5,719
Available-for-sale debt securities, gross unrealized loss (358) (687)
Available-for-sale debt securities, at fair value 138,859 129,306
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 52,101 43,950
Available-for-sale debt securities gross unrealized gain 1,968 1,903
Available-for-sale debt securities, gross unrealized loss (92) (129)
Available-for-sale debt securities, at fair value 53,977 45,724
Corporates [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 1,328,419 1,281,630
Available-for-sale debt securities gross unrealized gain 53,378 49,272
Available-for-sale debt securities, gross unrealized loss (3,034) (5,529)
Available-for-sale debt securities, at fair value 1,378,763 1,325,373
Residential Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 94,643 94,708
Available-for-sale debt securities gross unrealized gain 4,409 4,963
Available-for-sale debt securities, gross unrealized loss (116) (120)
Available-for-sale debt securities, at fair value 98,936 99,551
Other Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 81,079 72,772
Available-for-sale debt securities gross unrealized gain 482 98
Available-for-sale debt securities, gross unrealized loss (155) (303)
Available-for-sale debt securities, at fair value 81,406 72,567
Commercial Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale debt securities, amortized cost basis 125,096 107,201
Available-for-sale debt securities gross unrealized gain 2,880 2,712
Available-for-sale debt securities, gross unrealized loss (316) (470)
Available-for-sale debt securities, at fair value $ 127,660 $ 109,443
[1] Includes approximately $0.1 million of other-than-temporary impairment (“OTTI”) losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.
[2] Includes approximately $0.1 million of OTTI related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.