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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Less Than Twelve Months    
Number of securities | security 90 478
Gross unrealized losses $ 560 $ 3,357
Fair value $ 38,129 $ 231,759
Twelve Months or More    
Number of securities | security 52 39
Gross unrealized losses $ 675 $ 580
Fair value $ 17,232 $ 30,050
U.S. Government and Agency Securities    
Less Than Twelve Months    
Number of securities | security 8 73
Gross unrealized losses $ 13 $ 265
Fair value $ 4,817 $ 44,786
Twelve Months or More    
Number of securities | security 12 21
Gross unrealized losses $ 34 $ 209
Fair value $ 4,689 $ 11,250
States, Municipalities and Political Subdivisions    
Less Than Twelve Months    
Number of securities | security 18 61
Gross unrealized losses $ 59 $ 463
Fair value $ 20,600 $ 56,971
Twelve Months or More    
Number of securities | security 0 5
Gross unrealized losses $ 0 $ 27
Fair value $ 0 $ 7,620
Public Utilities    
Less Than Twelve Months    
Number of securities | security   8
Gross unrealized losses   $ 4
Fair value   $ 1,961
Twelve Months or More    
Number of securities | security   1
Gross unrealized losses   $ 29
Fair value   $ 1,015
Corporate Securities    
Less Than Twelve Months    
Number of securities | security 11 242
Gross unrealized losses $ 27 $ 2,025
Fair value $ 4,004 $ 92,429
Twelve Months or More    
Number of securities | security 17 9
Gross unrealized losses $ 456 $ 267
Fair value $ 10,248 $ 10,047
Redeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 7 7
Gross unrealized losses $ 53 $ 49
Fair value $ 724 $ 746
Twelve Months or More    
Number of securities | security 2 0
Gross unrealized losses $ 30 $ 0
Fair value $ 235 $ 0
Fixed Maturities    
Less Than Twelve Months    
Number of securities | security 44 391
Gross unrealized losses $ 152 $ 2,806
Fair value $ 30,145 $ 196,893
Twelve Months or More    
Number of securities | security 31 36
Gross unrealized losses $ 520 $ 532
Fair value $ 15,172 $ 29,932
Public Utilities    
Less Than Twelve Months    
Number of securities | security   4
Gross unrealized losses   $ 34
Fair value   $ 697
Twelve Months or More    
Number of securities | security   0
Gross unrealized losses   $ 0
Fair value   $ 0
Common Stock    
Less Than Twelve Months    
Number of securities | security 44 63
Gross unrealized losses $ 388 $ 497
Fair value $ 6,868 $ 6,665
Twelve Months or More    
Number of securities | security 13 3
Gross unrealized losses $ 140 $ 48
Fair value $ 1,415 $ 118
Nonredeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 1 19
Gross unrealized losses $ 2 $ 6
Fair value $ 128 $ 1,161
Twelve Months or More    
Number of securities | security 8 0
Gross unrealized losses $ 15 $ 0
Fair value $ 645 $ 0
Equity Securities    
Less Than Twelve Months    
Number of securities | security 45 87
Gross unrealized losses $ 390 $ 551
Fair value $ 6,996 $ 34,866
Twelve Months or More    
Number of securities | security 21 3
Gross unrealized losses $ 155 $ 48
Fair value $ 2,060 $ 118
Mutual Fund    
Less Than Twelve Months    
Number of securities | security   1
Gross unrealized losses   $ 14
Fair value   $ 26,343
Twelve Months or More    
Number of securities | security   0
Gross unrealized losses   $ 0
Fair value   $ 0
Other Long-term Investments    
Less Than Twelve Months    
Number of securities | security 1  
Gross unrealized losses $ 18  
Fair value $ 988  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value $ 0