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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($)
12 Months Ended
Nov. 04, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets [Line Items]        
Goodwill   $ 58,936,000 $ 58,312,000 $ 58,312,000
Accumulated Amortization   (32,943,000) (30,103,000)  
Balance, Gross   114,863,000 117,439,000  
Balance, Net   81,920,000 87,336,000 90,613,000
Goodwill, acquired during the year   1,800,000    
Impairment of goodwill and intangible assets   0 0 $ 0
Customer relationships        
Goodwill and Intangible Assets [Line Items]        
Finite-lived assets   51,400,000 51,400,000  
Accumulated Amortization   (32,943,000) (30,103,000)  
Finite-lived assets, Net   $ 18,457,000 $ 21,297,000  
Useful Life   15 years 15 years  
State licenses        
Goodwill and Intangible Assets [Line Items]        
Indefinite-lived assets   $ 4,527,000 $ 7,727,000  
Maiden Specialty        
Goodwill and Intangible Assets [Line Items]        
Goodwill, disposed during the year $ (1,120,000)      
Intangible assets, disposed during the year (3,200,000)      
IRC        
Goodwill and Intangible Assets [Line Items]        
Goodwill, acquired during the year $ 1,800,000