Employee Savings Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Maximum annual contributions per employee, percent	80.00%
Employer matching contribution, percent of match	50.00%
Employer matching contribution, percent of employees' gross pay	4.00%
Employer discretionary contribution amount	$ 400,000	$ 377,000	$ 347,000