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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 7,836 $ 8,984 $ 15,903 $ 17,816