Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 83,680	$ 83,680
Other intangible assets	420	1,000
Accumulated amortization on intangible assets	9,140	8,570
Intangible asset amortization	580	$ 690	$ 970
Expected amortization on other intangible assets
2017	360
2018	50
2019	$ 10