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Goodwill and Other Intangible Assets (Goodwill And Other Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]            
Goodwill, Gross $ 1,901,574   $ 1,901,574   $ 1,899,159 $ 877,239
Goodwill, Accumulated Impairment (112,934)   (112,934)   (112,934) (112,934)
Goodwill, Total 1,788,640 $ 1,024,335 1,788,640 $ 1,024,335 1,786,225 764,305
Goodwill, Net additions     2,415   1,021,920  
Finite-lived Intangible Assets [Roll Forward]            
Other Intangible Assets, Gross 113,471   113,471   113,471 58,909
Other Intangible Assets, Accumulated Amortization (65,157)   (65,157)   (56,738) (46,531)
Other Intangible Assets, Net 48,314   48,314   56,733 $ 12,378
Other Intangible Assets, Net additions         54,562  
Other Intangible Assets, Amortization $ (2,806) $ (3,103) $ (8,419) $ (7,105) $ (10,207)