Retirement Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Executive Officer [Member] | SERP [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Plan expense recognized	$ 192	$ 188	$ 402
Discount rate for benefit obligations	4.00%	4.30%
Accrued compensation	$ 3,319	$ 4,174
401K Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Recognized expense	$ 2,324	$ 2,363	$ 3,018