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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Intangible Assets [Abstract]        
Amortization expense $ 8 $ 8,860 $ 17,816 $ 17,679