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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Intangible Assets [Abstract]        
Amortization expense $ 8,845 $ 8,857 $ 26,661 $ 26,536