Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill (Amortization Expense) (Details)

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Intangible Assets and Goodwill (Amortization Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 13,164 $ 12,447 $ 10,442