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Investments - Schedule of Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 640,810 $ 319,654
Less Than 12 Months, Gross Unrealized Losses (15,259) (2,172)
12 Months or More, Fair Value 189,801 251,634
12 Months or More, Gross Unrealized Losses (9,594) (5,582)
Total, Fair Value 830,611 571,288
Total, Gross Unrealized Losses (24,853) (7,754)
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (14,997) (2,107)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 184,174 245,969
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,195 5,021
Debt Securities, Available-for-sale, Unrealized Loss Position (814,856) (559,764)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (24,192) (7,128)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 630,682 313,795
State and municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,800) (318)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,402 10,662
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 472 285
Debt Securities, Available-for-sale, Unrealized Loss Position (72,649) (50,779)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,272) (603)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 62,247 40,117
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,123) (261)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 76,384 84,193
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,145 2,180
Debt Securities, Available-for-sale, Unrealized Loss Position (167,902) (134,640)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (6,268) (2,441)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 91,518 50,447
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7,730) (846)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 57,914 66,954
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3,573 1,793
Debt Securities, Available-for-sale, Unrealized Loss Position (350,433) (180,418)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (11,303) (2,639)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 292,519 113,464
Commercial mortgage and asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,194) (244)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 20,388 25,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 735 454
Debt Securities, Available-for-sale, Unrealized Loss Position (132,638) (79,264)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,929) (698)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 112,250 53,965
Obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,689 32,154
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13 100
Debt Securities, Available-for-sale, Unrealized Loss Position (5,689) (35,178)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (13) (101)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 3,024
U.S. Treasury securities and obligations guaranteed by the U.S. government    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,115) (430)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 13,397 26,707
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 257 209
Debt Securities, Available-for-sale, Unrealized Loss Position (83,555) (77,467)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,372) (639)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 70,158 50,760
Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (35) (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position (1,990) (2,018)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (35) (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,990 2,018
Equity securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 10,128 5,859
Less Than 12 Months, Gross Unrealized Losses (262) (65)
12 Months or More, Fair Value 5,627 5,665
12 Months or More, Gross Unrealized Losses (399) (561)
Total, Fair Value 15,755 11,524
Total, Gross Unrealized Losses $ (661) $ (626)