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Intangible Assets (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Impairment of intangible assets $ 0 $ 0
Amortization expense of intangible assets $ 4,500,000 $ 20,100,000