Retirement Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Executive Officer [Member] | SERP [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Plan expense recognized	$ 188	$ 402	$ (152)
Discount rate for benefit obligations	4.30%	3.90%
Accrued compensation	$ 4,174	$ 4,280
401K Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Recognized expense	$ 2,363	$ 3,018	$ 2,802