Employee Benefit Plans - Projected and Accumulated Benefit Obligations, Employer Contributions and Benefit Payments for Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plans
Projected benefit obligation and accumulated benefit obligation for all defined benefit pension plans
Projected benefit obligation	$ 110,732	$ 108,938	$ 117,319
Accumulated benefit obligation	107,037	105,550
Fair value of plan assets	88,240	89,382	98,395
Aggregate projected benefit obligation and fair value of plan assets for pension pans with projected benefit obligations in excess of plan assets
Projected benefit obligation	110,732	99,920
Fair value of plan assets	88,240	80,091
Aggregate accumulated benefit obligation and fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation	107,037	96,532
Fair value of plan assets	88,240	80,091
Employer contributions
2017	2,885
Benefit Payments
2017	6,358
2018	6,144
2019	6,451
2020	6,841
2021	6,703
2022 - 2026	36,536
European Plans
Projected benefit obligation and accumulated benefit obligation for all defined benefit pension plans
Projected benefit obligation	43,495	39,201	42,886
Accumulated benefit obligation	40,886	37,133
Fair value of plan assets	27,936	29,351	$ 31,025
Aggregate projected benefit obligation and fair value of plan assets for pension pans with projected benefit obligations in excess of plan assets
Projected benefit obligation	31,570	28,150
Fair value of plan assets	15,872	17,042
Aggregate accumulated benefit obligation and fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets
Accumulated benefit obligation	28,962	26,083
Fair value of plan assets	15,872	$ 17,042
Employer contributions
2017	1,689
Benefit Payments
2017	1,251
2018	1,495
2019	1,159
2020	1,294
2021	1,249
2022 - 2026	$ 8,817