Employee Benefit Plans - Schedule of Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Liability, Defined Benefit Plan, Noncurrent	$ 14,757	$ 15,773
Change in benefit obligation:
Benefit obligation, Beginning balance	43,750	40,722
Service Cost	0	0	$ 0
Interest Cost	1,641	1,725	1,855
Actuarial losses	(3,522)	3,088
Benefit obligation, Ending balance	37,938	43,750	40,722
Change in plan assets:
Fair value of plan assets, Beginning balance	27,977	24,482
Actual return on plan assets	(2,093)	3,360
Employer contributions	1,228	1,920
Fair value of plan assets, Ending balance	23,181	27,977	$ 24,482
Defined Benefit Plan, Benefit Obligation, Benefits Paid	3,931	1,785
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 3,931	$ 1,785