Retirement Plans - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Executive Officer [Member] | SERP [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Plan expense recognized	$ 402,000	$ (152,000)	$ 477,000
Discount rate for benefit obligations	3.90%	4.70%
Accrued compensation	4,300,000	4,300,000
401K Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Recognized expense	3,018,000
Deferred Profit Sharing [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Recognized expense		$ 2,802,000	$ 2,609,000