Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill (Amortization Expense) (Details)

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Intangible Assets and Goodwill (Amortization Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 3,291 $ 3,147 $ 9,848 $ 9,183