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Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Other intangible assets      
Gross amount $ 159,503   $ 177,507
Accumulated impairment losses and amortization (102,537)   (111,639)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, net, ending balance 56,966    
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, net, ending balance 237,418    
Excluding Equity Method Investments      
Goodwill      
Gross amount 199,889 $ 199,889 212,983
Accumulated impairment losses and amortization (2,299) (2,299) (2,299)
Acquired during the year 13,094    
Goodwill 197,590 197,590 210,684
Other intangible assets      
Gross amount 96,599 96,599 114,599
Accumulated impairment losses and amortization (56,771) (51,044) (63,057)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, net, beginning balance 45,555    
Acquired during the year 18,000    
Amortization (6,286) (5,727)  
Other intangible assets, net, ending balance 39,828 45,555  
Goodwill and Other intangible assets, Total      
Gross amount 296,488 296,488 327,582
Accumulated impairment losses and amortization (59,070) (53,343) (65,356)
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, net, beginning balance 243,145    
Acquired during the year 31,094    
Amortization (6,286) (5,727)  
Goodwill and Other intangible assets, net, ending balance 237,418 243,145  
Equity Method Investments      
Goodwill      
Gross amount 15,098 12,318 15,098
Accumulated impairment losses and amortization (4,500) (4,500) (4,500)
Acquired during the year 0 2,780  
Goodwill 10,598 7,818 10,598
Other intangible assets      
Gross amount 62,904 51,796 62,908
Accumulated impairment losses and amortization (45,766) (42,880) (48,582)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, net, beginning balance 8,916    
Acquired during the year 4 11,108  
Amortization (2,816) (2,886)  
Other intangible assets, net, ending balance 17,138 8,916  
Goodwill and Other intangible assets, Total      
Gross amount 78,002 64,114 78,006
Accumulated impairment losses and amortization (50,266) (47,380) $ (53,082)
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, net, beginning balance 16,734    
Acquired during the year 4 13,888  
Amortization (2,816) (2,886)  
Goodwill and Other intangible assets, net, ending balance $ 27,736 $ 16,734