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Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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  
Excluding Equity Method Investments      
Goodwill      
Goodwill, Gross amount 199,889 8,160 $ 8,160
Accumulated impairment losses and amortization (2,299) (2,299) (2,299)
Goodwill [Roll Forward]      
Goodwill, Net, Beginning of Period 5,861 5,861  
Acquired during the year 191,729    
Goodwill, Net, End of Period 197,590 5,861  
Other intangible assets      
Gross amount 96,599 12,999 12,999
Accumulated impairment losses and amortization (29,035) (10,958) (10,749)
Intangible Assets, Net, Excluding Goodwill [Roll Forward]      
Other intangible assets, Net, Beginning of Period 2,041 2,250  
Acquired during the year 83,600    
Amortization (18,077) (209)  
Other intangible assets, Net, End of Period 67,564 2,041  
Goodwill and Other intangible assets, Total      
Gross amount, Beginning of Period 296,488 21,159 21,159
Accumulated impairment losses and amortization, Beginning of Period (31,334) (13,257) $ (13,048)
Intangible Assets, Net, Including Goodwill [Roll Forward]      
Goodwill and Other intangible assets, Net, Beginning of Period 7,902 8,111  
Acquired during the year 275,329    
Amortization (18,077) (209)  
Goodwill and Other intangible assets, Net, End of Period $ 265,154 $ 7,902