Employee Benefit Plans - Schedule of Benefit Obligation, Fair Value of Plan Assets, and Funded Status of our Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Change in Benefit Obligation [Roll Forward]
Service cost	$ 267	$ 258
Interest cost	4,151	4,228
Change in Plan Assets [Roll Forward]
Fair value of plan assets - ending	117,162
Pension Plan, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning	166,063	146,801
Service cost	267	258
Interest cost	4,151	4,228
Actuarial (gain) loss	(9,827)	4,910
Benefits paid	(3,625)	(4,313)
Settlements	(7,471)
Currency changes	(8,454)	14,179
Benefit obligation - ending	141,104	166,063
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	134,234	118,658
Employer contribution	2,796	2,974
Actual return on plan assets	(2,084)	5,454
Benefits paid	(3,625)	(4,313)
Settlements	(6,731)
Currency changes	(7,428)	11,461
Fair value of plan assets - ending	117,162	134,234
Underfunded status	$ (23,942)	$ (31,829)