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Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Liabilities    
Transfer into Level 3   $ 0
U.S. Government and government agencies    
Assets    
Total equity securities $ 15,950 17,083
Liabilities    
Transfer into Level 3   0
States, municipalities and political subdivisions    
Assets    
Total equity securities 375,077 386,260
Liabilities    
Transfer into Level 3   0
Foreign government    
Assets    
Total equity securities 5,978 6,429
Liabilities    
Transfer into Level 3   0
Residential mortgage-backed securities    
Assets    
Total equity securities 138,196 166,315
Liabilities    
Transfer into Level 3   0
Commercial mortgage-backed securities    
Assets    
Total equity securities 49,053 75,035
Liabilities    
Transfer into Level 3   0
Asset-backed securities    
Assets    
Total equity securities 77,665 34,451
Liabilities    
Transfer into Level 3   0
Corporate and other    
Assets    
Total equity securities 617,039 546,268
Liabilities    
Transfer into Level 3   0
Equity securities    
Assets    
Total equity securities 51,519 49,682
Liabilities    
Transfer into Level 3   0
Common stocks    
Assets    
Total equity securities 14,865 18,625
Liabilities    
Transfer into Level 3   0
Perpetual preferred stocks    
Assets    
Total equity securities 36,654 31,057
Liabilities    
Transfer into Level 3   0
Recurring    
Assets    
Derivatives 3,813 4,843
Total assets not accounted for at fair value 1,334,290 1,286,366
Liabilities    
Total liabilities not accounted for at fair value 16,285 4,332
Recurring | Total fixed maturity securities    
Assets    
Total equity securities 1,278,958 1,231,841
Recurring | U.S. Government and government agencies    
Assets    
Total equity securities 15,950 17,083
Recurring | States, municipalities and political subdivisions    
Assets    
Total equity securities 375,077 386,260
Recurring | Foreign government    
Assets    
Total equity securities 5,978 6,429
Recurring | Residential mortgage-backed securities    
Assets    
Total equity securities 138,196 166,315
Recurring | Commercial mortgage-backed securities    
Assets    
Total equity securities 49,053 75,035
Recurring | Asset-backed securities    
Assets    
Total equity securities 77,665 34,451
Recurring | Corporate and other    
Assets    
Total equity securities 617,039 546,268
Liabilities    
Level 1 into Level 2 transfers 1,100  
Recurring | Equity securities    
Assets    
Total equity securities 51,519 49,682
Recurring | Common stocks    
Assets    
Total equity securities 14,865 18,625
Recurring | Perpetual preferred stocks    
Assets    
Total equity securities 36,654 31,057
Liabilities    
Level 1 into Level 2 transfers 500  
Recurring | Level 1    
Assets    
Derivatives 0 632
Total assets not accounted for at fair value 26,762 37,439
Liabilities    
Total liabilities not accounted for at fair value 0 0
Recurring | Level 1 | Total fixed maturity securities    
Assets    
Total equity securities 7,160 12,843
Recurring | Level 1 | U.S. Government and government agencies    
Assets    
Total equity securities 5,140 5,753
Recurring | Level 1 | States, municipalities and political subdivisions    
Assets    
Total equity securities 0 0
Recurring | Level 1 | Foreign government    
Assets    
Total equity securities 0 0
Recurring | Level 1 | Residential mortgage-backed securities    
Assets    
Total equity securities 0 0
Recurring | Level 1 | Commercial mortgage-backed securities    
Assets    
Total equity securities 0 0
Recurring | Level 1 | Asset-backed securities    
Assets    
Total equity securities 0 0
Recurring | Level 1 | Corporate and other    
Assets    
Total equity securities 2,020 7,090
Recurring | Level 1 | Equity securities    
Assets    
Total equity securities 19,602 23,964
Recurring | Level 1 | Common stocks    
Assets    
Total equity securities 10,290 13,693
Recurring | Level 1 | Perpetual preferred stocks    
Assets    
Total equity securities 9,312 10,271
Recurring | Level 2    
Assets    
Derivatives 0 0
Total assets not accounted for at fair value 1,100,863 1,052,911
Liabilities    
Total liabilities not accounted for at fair value 0 0
Recurring | Level 2 | Total fixed maturity securities    
Assets    
Total equity securities 1,073,521 1,032,125
Recurring | Level 2 | U.S. Government and government agencies    
Assets    
Total equity securities 10,778 11,257
Recurring | Level 2 | States, municipalities and political subdivisions    
Assets    
Total equity securities 369,387 380,601
Recurring | Level 2 | Foreign government    
Assets    
Total equity securities 5,978 6,429
Recurring | Level 2 | Residential mortgage-backed securities    
Assets    
Total equity securities 82,242 87,296
Recurring | Level 2 | Commercial mortgage-backed securities    
Assets    
Total equity securities 6,035 14,510
Recurring | Level 2 | Asset-backed securities    
Assets    
Total equity securities 4,448 6,798
Recurring | Level 2 | Corporate and other    
Assets    
Total equity securities 594,653 525,234
Recurring | Level 2 | Equity securities    
Assets    
Total equity securities 27,342 20,786
Recurring | Level 2 | Common stocks    
Assets    
Total equity securities 0 0
Recurring | Level 2 | Perpetual preferred stocks    
Assets    
Total equity securities 27,342 20,786
Recurring | Level 3    
Assets    
Derivatives 3,813 4,211
Total assets not accounted for at fair value 206,665 196,016
Liabilities    
Other 1,500  
Total liabilities not accounted for at fair value 16,285 4,332
Recurring | Level 3 | Total fixed maturity securities    
Assets    
Total equity securities 198,277 186,873
Recurring | Level 3 | U.S. Government and government agencies    
Assets    
Total equity securities 32 73
Recurring | Level 3 | States, municipalities and political subdivisions    
Assets    
Total equity securities 5,690 5,659
Recurring | Level 3 | Foreign government    
Assets    
Total equity securities 0 0
Recurring | Level 3 | Residential mortgage-backed securities    
Assets    
Total equity securities 55,954 79,019
Recurring | Level 3 | Commercial mortgage-backed securities    
Assets    
Total equity securities 43,018 60,525
Recurring | Level 3 | Asset-backed securities    
Assets    
Total equity securities 73,217 27,653
Recurring | Level 3 | Corporate and other    
Assets    
Total equity securities 20,366 13,944
Recurring | Level 3 | Equity securities    
Assets    
Total equity securities 4,575 4,932
Recurring | Level 3 | Common stocks    
Assets    
Total equity securities 4,575 4,932
Recurring | Level 3 | Perpetual preferred stocks    
Assets    
Total equity securities 0 0
Asset-backed securities    
Liabilities    
Transfer into Level 3 3,300  
Warrant liability | Recurring    
Liabilities    
Warrant liability 4,058 4,332
Warrant liability | Recurring | Level 1    
Liabilities    
Warrant liability 0 0
Warrant liability | Recurring | Level 2    
Liabilities    
Warrant liability 0 0
Warrant liability | Recurring | Level 3    
Liabilities    
Warrant liability 4,058 $ 4,332
Contingent liability | Recurring    
Liabilities    
Contingent liability 11,411  
Contingent liability | Recurring | Level 1    
Liabilities    
Contingent liability 0  
Contingent liability | Recurring | Level 2    
Liabilities    
Contingent liability 0  
Contingent liability | Recurring | Level 3    
Liabilities    
Contingent liability 11,411  
Other | Recurring    
Liabilities    
Other 816  
Other | Recurring | Level 1    
Liabilities    
Other 0  
Other | Recurring | Level 2    
Liabilities    
Other 0  
Other | Recurring | Level 3    
Liabilities    
Other $ 816