Employee Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Retirement savings plan, contributions by employer	$ 1,000,000	$ 1,000,000	$ 948,000
Health insurance benefits cost	1,400,000	1,300,000	1,200,000
Severance Costs	6,900,000	3,700,000
Equity based severance	$ 2,891,000	$ 1,352,000	$ 0