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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Less Than Twelve Months    
Number of securities | security 220 478
Gross unrealized losses $ 713 $ 3,357
Fair value $ 112,320 $ 231,759
Twelve Months or More    
Number of securities | security 29 39
Gross unrealized losses $ 207 $ 580
Fair value $ 5,534 $ 30,050
U.S. Government and Agency Securities    
Less Than Twelve Months    
Number of securities | security 75 73
Gross unrealized losses $ 197 $ 265
Fair value $ 51,848 $ 44,786
Twelve Months or More    
Number of securities | security 0 21
Gross unrealized losses $ 0 $ 209
Fair value $ 0 $ 11,250
States, Municipalities and Political Subdivisions    
Less Than Twelve Months    
Number of securities | security 53 61
Gross unrealized losses $ 166 $ 463
Fair value $ 42,276 $ 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 4 8
Gross unrealized losses $ 2 $ 4
Fair value $ 651 $ 1,961
Twelve Months or More    
Number of securities | security 0 1
Gross unrealized losses $ 0 $ 29
Fair value $ 0 $ 1,015
Corporate Securities    
Less Than Twelve Months    
Number of securities | security 48 242
Gross unrealized losses $ 14 $ 2,025
Fair value $ 9,925 $ 92,429
Twelve Months or More    
Number of securities | security 3 9
Gross unrealized losses $ 10 $ 267
Fair value $ 3,038 $ 10,047
Redeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 3 7
Gross unrealized losses $ 36 $ 49
Fair value $ 312 $ 746
Twelve Months or More    
Number of securities | security 2 0
Gross unrealized losses $ 38 $ 0
Fair value $ 230 $ 0
Fixed Maturities    
Less Than Twelve Months    
Number of securities | security 183 391
Gross unrealized losses $ 415 $ 2,806
Fair value $ 105,012 $ 196,893
Twelve Months or More    
Number of securities | security 5 36
Gross unrealized losses $ 48 $ 532
Fair value $ 3,268 $ 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 31 63
Gross unrealized losses $ 269 $ 497
Fair value $ 5,486 $ 6,665
Twelve Months or More    
Number of securities | security 17 3
Gross unrealized losses $ 139 $ 48
Fair value $ 1,887 $ 118
Nonredeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 5 19
Gross unrealized losses $ 8 $ 6
Fair value $ 835 $ 1,161
Twelve Months or More    
Number of securities | security 7 0
Gross unrealized losses $ 20 $ 0
Fair value $ 379 $ 0
Equity Securities    
Less Than Twelve Months    
Number of securities | security 36 87
Gross unrealized losses $ 277 $ 551
Fair value $ 6,321 $ 34,866
Twelve Months or More    
Number of securities | security 24 3
Gross unrealized losses $ 159 $ 48
Fair value $ 2,266 $ 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 $ 21  
Fair value $ 987  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value $ 0