Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Expected return on plan assets, percentage	7.80%
Discretionary contributions towards 401(k) plan, maximum percentage	4.00%
Discretionary contributions to 401(k) plans	$ 1,213	$ 1,230
Defined contribution plan, cost	$ 2,004	$ 1,914