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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 940,471 $ 834,531
Less Than Twelve Months    
Number of securities | security 1,101 542
Gross unrealized losses $ 13,373 $ 2,361
Fair value $ 681,459 $ 349,028
Twelve Months or More    
Number of securities | security 199 214
Gross unrealized losses $ 3,446 $ 2,394
Fair value 104,087 111,703
U.S. Government and Agency Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 88,481 $ 92,626
Less Than Twelve Months    
Number of securities | security 41 40
Gross unrealized losses $ 547 $ 166
Fair value $ 33,151 $ 26,979
Twelve Months or More    
Number of securities | security 57 73
Gross unrealized losses $ 1,364 $ 1,075
Fair value 53,423 58,980
States, Municipalities and Political Subdivisions    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 159,815 $ 201,512
Less Than Twelve Months    
Number of securities | security 145 106
Gross unrealized losses $ 1,634 $ 734
Fair value $ 113,255 $ 91,245
Twelve Months or More    
Number of securities | security 23 31
Gross unrealized losses $ 363 $ 389
Fair value 14,571 19,718
Public Utilities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 25,172 $ 20,257
Less Than Twelve Months    
Number of securities | security 43 16
Gross unrealized losses $ 668 $ 44
Fair value $ 22,118 $ 7,052
Twelve Months or More    
Number of securities | security 5 5
Gross unrealized losses $ 70 $ 41
Fair value 986 1,016
Corporate Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 284,328 $ 287,562
Less Than Twelve Months    
Number of securities | security 521 263
Gross unrealized losses $ 5,860 $ 871
Fair value $ 240,733 $ 134,755
Twelve Months or More    
Number of securities | security 44 52
Gross unrealized losses $ 737 $ 338
Fair value 18,231 16,476
Mortgage-backed securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 207,646 $ 143,265
Less Than Twelve Months    
Number of securities | security 187 89
Gross unrealized losses $ 3,923 $ 475
Fair value $ 176,704 $ 76,349
Twelve Months or More    
Number of securities | security 60 50
Gross unrealized losses $ 788 $ 477
Fair value 15,118 15,210
Asset-backed Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 79,778 $ 14,905
Less Than Twelve Months    
Number of securities | security 87 18
Gross unrealized losses $ 214 $ 20
Fair value $ 70,926 $ 11,682
Twelve Months or More    
Number of securities | security 5 0
Gross unrealized losses $ 3 $ 0
Fair value 1,249 0
Redeemable Preferred Stocks    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 685 $ 692
Less Than Twelve Months    
Number of securities | security 1 0
Gross unrealized losses $ 3 $ 0
Fair value $ 122 $ 0
Twelve Months or More    
Number of securities | security 3 3
Gross unrealized losses $ 85 $ 74
Fair value 304 303
Fixed Maturities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 848,884 $ 762,855
Less Than Twelve Months    
Number of securities | security 1,030 532
Gross unrealized losses $ 12,873 $ 2,310
Fair value $ 659,988 $ 348,062
Twelve Months or More    
Number of securities | security 197 214
Gross unrealized losses $ 3,410 $ 2,394
Fair value 103,882 111,703
Public Utilities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 2,242 1,702
Less Than Twelve Months    
Number of securities | security 4  
Gross unrealized losses $ 30  
Fair value $ 629  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value 0  
Common Stock    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 31,802 $ 27,902
Less Than Twelve Months    
Number of securities | security 54 5
Gross unrealized losses $ 410 $ 47
Fair value $ 5,342 $ 748
Twelve Months or More    
Number of securities | security 2 0
Gross unrealized losses $ 36 $ 0
Fair value 205 0
Nonredeemable Preferred Stocks    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 1,741 $ 1,767
Less Than Twelve Months    
Number of securities | security 12 4
Gross unrealized losses $ 16 $ 4
Fair value $ 563 $ 87
Twelve Months or More    
Number of securities | security 0 0
Gross unrealized losses $ 0 $ 0
Fair value 0 0
Equity Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 83,345 $ 63,295
Less Than Twelve Months    
Number of securities | security 71 10
Gross unrealized losses $ 500 $ 51
Fair value $ 21,471 $ 966
Twelve Months or More    
Number of securities | security 2 0
Gross unrealized losses $ 36 $ 0
Fair value 205 0
Other Long-term Investments    
Schedule of Available-for-sale Securities    
Available-for-sale Securities 8,242 8,381
Mutual Fund    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 47,560 $ 31,924
Less Than Twelve Months    
Number of securities | security 1 1
Gross unrealized losses $ 44 $ 0
Fair value $ 14,937 $ 131
Twelve Months or More    
Number of securities | security 0 0
Gross unrealized losses $ 0 $ 0
Fair value 0 0
Foreign Government    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 2,979 $ 2,036
Less Than Twelve Months    
Number of securities | security 5  
Gross unrealized losses $ 24  
Fair value $ 2,979  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value $ 0