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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 559,307  
Accumulated impairment losses (85,890)  
Net goodwill at September 30, 2015 $ 473,417 $ 559,307