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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 937,812 $ 834,531
Less Than Twelve Months    
Number of securities | security 1,110 542
Gross unrealized losses $ 13,092 $ 2,361
Fair value $ 624,679 $ 349,028
Twelve Months or More    
Number of securities | security 297 214
Gross unrealized losses $ 6,165 $ 2,394
Fair value 167,567 111,703
U.S. Government and Agency Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 102,729 $ 92,626
Less Than Twelve Months    
Number of securities | security 83 40
Gross unrealized losses $ 580 $ 166
Fair value $ 48,600 $ 26,979
Twelve Months or More    
Number of securities | security 56 73
Gross unrealized losses $ 1,513 $ 1,075
Fair value 54,114 58,980
States, Municipalities and Political Subdivisions    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 151,866 $ 201,512
Less Than Twelve Months    
Number of securities | security 132 106
Gross unrealized losses $ 1,742 $ 734
Fair value $ 103,690 $ 91,245
Twelve Months or More    
Number of securities | security 43 31
Gross unrealized losses $ 976 $ 389
Fair value 30,133 19,718
Public Utilities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 24,142 $ 20,257
Less Than Twelve Months    
Number of securities | security 41 16
Gross unrealized losses $ 672 $ 44
Fair value $ 19,812 $ 7,052
Twelve Months or More    
Number of securities | security 6 5
Gross unrealized losses $ 103 $ 41
Fair value 1,976 1,016
Corporate Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 289,596 $ 287,562
Less Than Twelve Months    
Number of securities | security 481 263
Gross unrealized losses $ 4,752 $ 871
Fair value $ 217,405 $ 134,755
Twelve Months or More    
Number of securities | security 90 52
Gross unrealized losses $ 1,858 $ 338
Fair value 49,688 16,476
Mortgage-backed securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 204,990 $ 143,265
Less Than Twelve Months    
Number of securities | security 180 89
Gross unrealized losses $ 4,683 $ 475
Fair value $ 173,692 $ 76,349
Twelve Months or More    
Number of securities | security 89 50
Gross unrealized losses $ 1,615 $ 477
Fair value 29,984 15,210
Asset-backed Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 58,898 $ 14,905
Less Than Twelve Months    
Number of securities | security 83 18
Gross unrealized losses $ 250 $ 20
Fair value $ 51,428 $ 11,682
Twelve Months or More    
Number of securities | security 7 0
Gross unrealized losses $ 2 $ 0
Fair value 1,362 0
Redeemable Preferred Stocks    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 1,203 $ 692
Less Than Twelve Months    
Number of securities | security 8 0
Gross unrealized losses $ 25 $ 0
Fair value $ 749 $ 0
Twelve Months or More    
Number of securities | security 2 3
Gross unrealized losses $ 60 $ 74
Fair value 200 303
Fixed Maturities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 836,390 $ 762,855
Less Than Twelve Months    
Number of securities | security 1,013 532
Gross unrealized losses $ 12,736 $ 2,310
Fair value $ 618,342 $ 348,062
Twelve Months or More    
Number of securities | security 293 214
Gross unrealized losses $ 6,127 $ 2,394
Fair value 167,457 111,703
Public Utilities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 2,357 1,702
Less Than Twelve Months    
Number of securities | security 8  
Gross unrealized losses $ 19  
Fair value $ 672  
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 $ 37,568 $ 27,902
Less Than Twelve Months    
Number of securities | security 70 5
Gross unrealized losses $ 305 $ 47
Fair value $ 4,103 $ 748
Twelve Months or More    
Number of securities | security 1 0
Gross unrealized losses $ 36 $ 0
Fair value 91 0
Nonredeemable Preferred Stocks    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 2,072 $ 1,767
Less Than Twelve Months    
Number of securities | security 18 4
Gross unrealized losses $ 32 $ 4
Fair value $ 1,506 $ 87
Twelve Months or More    
Number of securities | security 3 0
Gross unrealized losses $ 2 $ 0
Fair value 19 0
Equity Securities    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 93,092 $ 63,295
Less Than Twelve Months    
Number of securities | security 97 10
Gross unrealized losses $ 356 $ 51
Fair value $ 6,337 $ 966
Twelve Months or More    
Number of securities | security 4 0
Gross unrealized losses $ 38 $ 0
Fair value 110 0
Other Long-term Investments    
Schedule of Available-for-sale Securities    
Available-for-sale Securities 8,330 8,381
Mutual Fund    
Schedule of Available-for-sale Securities    
Available-for-sale Securities $ 51,095 $ 31,924
Less Than Twelve Months    
Number of securities | security 1 1
Gross unrealized losses $ 0 $ 0
Fair value $ 56 $ 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 $ 2,966 $ 2,036
Less Than Twelve Months    
Number of securities | security 5  
Gross unrealized losses $ 32  
Fair value $ 2,966  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value $ 0