Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Expected return on plan assets (as a percent)			8.00%
Discretionary contributions towards 401(k) Plan, maximum (as a percent)			4.00%	4.00%
Discretionary contributions to 401 (k) plans	$ 496	$ 475	$ 1,564	$ 1,391
Contributions to various defined contribution plans	$ 1,792	$ 1,566	$ 3,505	$ 3,048