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Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other intangible assets      
Gross amount $ 148,395 $ 148,395  
Accumulated impairment losses and amortization (93,924) (82,937)  
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, net, beginning balance 65,458    
Other intangible assets, net, ending balance 54,471 65,458  
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, net, beginning balance 251,186    
Goodwill and Other intangible assets, net, ending balance 243,145 251,186  
Excluding Equity Method Investments      
Goodwill      
Goodwill, gross amount 199,889 199,889 $ 199,889
Accumulated impairment losses and amortization (2,299) (2,299) (2,299)
Goodwill 197,590 197,590 197,590
Other intangible assets      
Gross amount 96,599 96,599 96,599
Accumulated impairment losses and amortization (51,044) (43,003) (29,035)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, net, beginning balance 53,596 67,564  
Amortization (8,041) (13,968)  
Other intangible assets, net, ending balance 45,555 53,596  
Goodwill and Other intangible assets, Total      
Gross amount 296,488 296,488 296,488
Accumulated impairment losses and amortization (53,343) (45,302) $ (31,334)
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, net, beginning balance 251,186 265,154  
Amortization (8,041) (13,968)  
Goodwill and Other intangible assets, net, ending balance $ 243,145 $ 251,186