Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Aggregate amortization expense (Details 1)

v3.8.0.1
Goodwill and Intangible Assets - Aggregate amortization expense (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 31,232 $ 22,160 $ 73,207