Employee Benefit Plans - Contribution Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Contribution to the 401(k) Plan	$ 29	$ 909	$ 255	$ 2,122
Contribution to the defined benefit plans	$ 2,646	$ 2,762	$ 5,624	$ 4,816