Goodwill & Other Intangible Assets (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 3.5	$ 4.1	$ 5.7
Acquired finite-lived intangible assets, weighted average useful life	2 years 5 months