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Goodwill and Other Intangible Assets (Schedule of Goodwill and Other Intangible Assets Included in Equity Method Investments) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Other intangible assets      
Gross amount $ 148,395 $ 58,399  
Accumulated impairment losses and amortization (65,495) (43,424)  
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, Net, Beginning of Period 14,975    
Other intangible assets, Net, End of Period 82,900 14,975  
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, Net, Beginning of Period 7,902    
Goodwill and Other intangible assets, Net, End of Period 265,154 7,902  
Investments in other ventures      
Goodwill      
Goodwill, Gross amount 12,318 12,318 $ 12,545
Accumulated impairment losses and amortization (4,500) 0 0
Goodwill [Roll Forward]      
Goodwill, Net, Beginning of Period 12,318 12,545  
Adjustments to gross amount   (227)  
Acquired during the year 0    
Impairment losses (4,500)    
Goodwill, Net, End of Period 7,818 12,318  
Other intangible assets      
Gross amount 51,796 45,400 45,478
Accumulated impairment losses and amortization (36,460) (32,466) (28,811)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, Net, Beginning of Period 12,934 16,667  
Adjustments to gross amount   (78)  
Acquired during the year 6,396    
Amortization (2,900) (3,655)  
Impairment losses (1,094)    
Other intangible assets, Net, End of Period 15,336 12,934  
Goodwill and Other intangible assets, Total      
Gross amount, Beginning of Period 64,114 57,718 58,023
Accumulated impairment losses and amortization, Beginning of Period (40,960) (32,466) $ (28,811)
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, Net, Beginning of Period 25,252 29,212  
Adjustments to gross amounts   (305)  
Acquired during the year 6,396    
Amortization (2,900) (3,655)  
Impairment losses (5,594)    
Goodwill and Other intangible assets, Net, End of Period $ 23,154 $ 25,252