Employee Benefit Plans - Changes in Benefit Obligations and Fair Value of Assets, Funded Status and Actuarial Assumptions for Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Plans
Change in Projected Benefit Obligations
Projected benefit obligation as of beginning of year	$ 108,938	$ 117,319
Service cost	957	1,136	$ 895
Interest cost	4,589	4,499	4,815
Actuarial loss (gain)	4,293	(7,551)
Benefits paid	(4,094)	(4,022)
Settlement	(3,951)	(2,443)
Projected benefit obligation as of end of year	110,732	108,938	117,319
Change in Plan Assets
Fair value of plan assets as of beginning of year	89,382	98,395
Actual return on plan assets	6,221	(3,830)
Employer contributions	682	1,282
Benefits paid	(4,094)	(4,022)
Settlement	(3,951)	(2,443)	(4,400)
Fair value of plan assets as of end of year	88,240	89,382	98,395
Funded status as of end of year	(22,492)	(19,556)
Amounts recognized in the Balance Sheets:
Net amount recognized	(22,492)	(19,556)
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Accumulated net actuarial loss	38,694	38,741
Net amount recognized, before tax effect	$ 38,694	$ 38,741
Weighted-average assumptions used to determine benefit obligations at period end:
Discount rate (as a percent)	4.09%	4.38%
Rate of increase in compensation levels (as a percent)	3.00%	3.00%
U.S. Plans | Other assets
Amounts recognized in the Balance Sheets:
Noncurrent asset		$ 273
U.S. Plans | Payroll and benefits payable
Amounts recognized in the Balance Sheets:
Current liability	$ (82)	(82)
U.S. Plans | Accrued pension and other liabilities
Amounts recognized in the Balance Sheets:
Noncurrent liability	(22,410)	(19,747)
European Plans
Change in Projected Benefit Obligations
Projected benefit obligation as of beginning of year	39,201	42,886
Service cost	395	288	342
Interest cost	1,142	1,250	1,653
Employee contributions	73	71
Actuarial loss (gain)	7,018	(64)
Benefits paid	(1,527)	(1,091)
Acquisition	3,899
Plan Amendments	(91)
Settlement	(1,224)	(1,383)
Foreign currency exchange rate changes	(5,391)	(2,756)
Projected benefit obligation as of end of year	43,495	39,201	42,886
Change in Plan Assets
Fair value of plan assets as of beginning of year	29,351	31,025
Actual return on plan assets	4,212	646
Employer contributions	1,744	1,774
Employee contributions	73	71
Benefits paid	(1,527)	(1,091)
Settlement	(1,224)	(1,383)
Foreign currency exchange rate changes	(4,693)	(1,691)
Fair value of plan assets as of end of year	27,936	29,351	$ 31,025
Funded status as of end of year	(15,559)	(9,850)
Amounts recognized in the Balance Sheets:
Net amount recognized	(15,559)	(9,850)
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Accumulated prior service cost	(91)
Accumulated net actuarial loss	10,549	8,039
Net amount recognized, before tax effect	$ 10,458	$ 8,039
Weighted-average assumptions used to determine benefit obligations at period end:
Discount rate (as a percent)	2.11%	3.15%
Rate of increase in compensation levels (as a percent)	2.87%	3.37%
European Plans | Other assets
Amounts recognized in the Balance Sheets:
Noncurrent asset	$ 141	$ 1,258
European Plans | Payroll and benefits payable
Amounts recognized in the Balance Sheets:
Current liability	(493)	(450)
European Plans | Accrued pension and other liabilities
Amounts recognized in the Balance Sheets:
Noncurrent liability	$ (15,207)	$ (10,658)