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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 02, 2015
Dec. 31, 2014
Minimum          
Goodwill and Intangible Assets [Line Items]          
Finite-lived intangible assets, useful life   1 year      
Maximum          
Goodwill and Intangible Assets [Line Items]          
Finite-lived intangible assets, useful life   17 years      
Weighted Average          
Goodwill and Intangible Assets [Line Items]          
Finite-lived intangible assets, useful life   8 years 5 months 23 days      
Investments in other ventures, under equity method          
Goodwill and Intangible Assets [Line Items]          
Goodwill $ 7,818 $ 7,818 $ 7,818   $ 12,318
Goodwill, impairment loss     (4,500)    
Impairment of intangible assets     $ (1,094)    
Investments in other ventures, under equity method | Angus Partners LLC          
Goodwill and Intangible Assets [Line Items]          
Goodwill, impairment loss (4,500)        
Impairment of intangible assets $ (1,100)        
Platinum Underwriters Holdings, Ltd.          
Goodwill and Intangible Assets [Line Items]          
Goodwill       $ 191,729  
Finite lived intangible assets acquired       75,200  
Indefinite lived intangible assets acquired       $ 8,400