Employee Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Retirement savings plan, contributions by employer	$ 1,000,000	$ 948,000	$ 943,000
Health insurance benefits cost	1,300,000	$ 1,200,000	$ 1,100,000
Severance Costs	$ 3,700,000