Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 44,438	$ 44,438
Amortization expense	$ 2,700	$ 3,200	$ 3,300
Customer Relationships
Goodwill [Line Items]
Weighted average amortization period	9 years 8 months