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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Less Than Twelve Months    
Number of securities | security 400 646
Gross unrealized losses $ 1,655 $ 5,898
Fair value $ 224,831 $ 344,434
Twelve Months or More    
Number of securities | security 118 25
Gross unrealized losses $ 980 $ 236
Fair value $ 59,295 $ 3,122
U.S. Government and Agency Securities    
Less Than Twelve Months    
Number of securities | security 147 186
Gross unrealized losses $ 741 $ 1,893
Fair value $ 81,333 $ 111,216
Twelve Months or More    
Number of securities | security 57 0
Gross unrealized losses $ 553 $ 0
Fair value $ 36,900 $ 0
States, Municipalities and Political Subdivisions    
Less Than Twelve Months    
Number of securities | security 62 201
Gross unrealized losses $ 274 $ 2,551
Fair value $ 50,719 $ 136,360
Twelve Months or More    
Number of securities | security 23 0
Gross unrealized losses $ 155 $ 0
Fair value $ 16,625 $ 0
Public Utilities    
Less Than Twelve Months    
Number of securities | security 9 8
Gross unrealized losses $ 24 $ 73
Fair value $ 3,966 $ 2,222
Twelve Months or More    
Number of securities | security 4 0
Gross unrealized losses $ 27 $ 0
Fair value $ 625 $ 0
Corporate Securities    
Less Than Twelve Months    
Number of securities | security 152 215
Gross unrealized losses $ 515 $ 1,100
Fair value $ 77,334 $ 88,605
Twelve Months or More    
Number of securities | security 21 1
Gross unrealized losses $ 65 $ 26
Fair value $ 3,531 $ 1,021
Asset-backed Securities    
Less Than Twelve Months    
Number of securities | security 16  
Gross unrealized losses $ 8  
Fair value $ 10,367  
Twelve Months or More    
Number of securities | security 0  
Gross unrealized losses $ 0  
Fair value $ 0  
Redeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 0 7
Gross unrealized losses $ 0 $ 62
Fair value $ 0 $ 764
Twelve Months or More    
Number of securities | security 3 0
Gross unrealized losses $ 63 $ 0
Fair value $ 308 $ 0
Fixed Maturities    
Less Than Twelve Months    
Number of securities | security 386 617
Gross unrealized losses $ 1,562 $ 5,679
Fair value $ 223,719 $ 339,167
Twelve Months or More    
Number of securities | security 108 1
Gross unrealized losses $ 863 $ 26
Fair value $ 57,989 $ 1,021
Common Stock    
Less Than Twelve Months    
Number of securities | security 9 16
Gross unrealized losses $ 87 $ 140
Fair value $ 765 $ 2,450
Twelve Months or More    
Number of securities | security 4 17
Gross unrealized losses $ 62 $ 179
Fair value $ 429 $ 1,732
Nonredeemable Preferred Stocks    
Less Than Twelve Months    
Number of securities | security 5 12
Gross unrealized losses $ 6 $ 52
Fair value $ 347 $ 1,830
Twelve Months or More    
Number of securities | security 6 7
Gross unrealized losses $ 55 $ 31
Fair value $ 877 $ 369
Equity Securities    
Less Than Twelve Months    
Number of securities | security 14 28
Gross unrealized losses $ 93 $ 192
Fair value $ 1,112 $ 4,280
Twelve Months or More    
Number of securities | security 10 24
Gross unrealized losses $ 117 $ 210
Fair value $ 1,306 $ 2,101
Other Long-term Investments    
Less Than Twelve Months    
Number of securities | security   1
Gross unrealized losses   $ 27
Fair value   $ 987
Twelve Months or More    
Number of securities | security   0
Gross unrealized losses   $ 0
Fair value   $ 0