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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, 2015
Mar. 31, 2015
Mar. 02, 2015
Dec. 31, 2014
Dec. 31, 2013
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   25 years        
Weighted Average            
Goodwill and Intangible Assets [Line Items]            
Finite-lived intangible assets, useful life   8 years 1 month 6 days        
Investments in other ventures            
Goodwill and Intangible Assets [Line Items]            
Goodwill $ 7,818 $ 7,818     $ 12,318 $ 12,545
Goodwill, impairment loss   (4,500)        
Impairment of intangible assets   $ (1,094)        
Investments in other ventures | Angus Partners LLC            
Goodwill and Intangible Assets [Line Items]            
Goodwill, impairment loss (4,500)          
Impairment of intangible assets $ (1,094)          
Platinum            
Goodwill and Intangible Assets [Line Items]            
Goodwill     $ 191,729 $ 191,729    
Finite lived intangible assets acquired       75,200    
Indefinite lived intangible assets acquired       $ 8,400