Employee Benefit Plans Employee Benefit Plans 17 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employer's contribution	$ 2,200	$ 2,100	$ 1,900
Employer discretionary contribution amount	$ 951	$ 755	$ 568