Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill (Narrative) (Details)

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Intangible Assets and Goodwill (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 $ 16,400 $ 780 $ 21,600 $ 1,500