Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization	$ 13,888	$ 12,564	$ 11,749
Maximum
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life (in years)	15 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, useful life (in years)	3 years