Benefit Plans 401(K) Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Number of days of continuous employment to be eligible	90 days
Maximum annual contribution by employee	6.00%
Employer match	50.00%
Contributions by employer	$ 192,000	$ 161,000	$ 155,000