Employee Benefit Plans - Changes in Benefit Obligations and Fair Value of Assets, Funded Status and Actuarial Assumptions for Pension Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) plan	Dec. 31, 2014 USD ($) plan	Dec. 31, 2013 USD ($)
Pensions
Settlement charge	$ 800
Change in Plan Assets
Settlement	$ (3,800)
U.S. Plans
Pensions
Number of plans which do not allow existing participants to continue to earn benefits | plan	2
Number of plans that offered participants to elect a lump sum payment of their respective pension benefits | plan		2
Settlement charge	$ 607	$ 1,025
Increase in benefit obligation from change in mortality assumptions		5,800
Increase in benefit obligation from change in discount rate assumptions		12,300
Change in Projected Benefit Obligations
Projected benefit obligation as of beginning of year	117,319	102,309
Service cost	1,136	895	$ 1,165
Interest cost	4,499	4,815	4,423
Actuarial (gain) loss	(7,551)	17,544
Benefits paid	(4,022)	(3,831)
Settlement	(2,443)	(4,413)
Projected benefit obligation as of end of year	108,938	117,319	102,309
Change in Plan Assets
Fair value of plan assets as of beginning of year	98,395	99,784
Actual return on plan assets	(3,830)	5,329
Employer contributions	1,282	1,526
Benefits paid	(4,022)	(3,831)
Settlement	(2,443)	(4,413)
Fair value of plan assets as of end of year	89,382	98,395	99,784
Funded status as of end of year	(19,556)	(18,924)
Amounts recognized in the Balance Sheets:
Net amount recognized	(19,556)	(18,924)
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Accumulated prior service cost		15
Accumulated net actuarial loss	38,741	38,606
Net amount recognized, before tax effect	38,741	38,621
Accumulated benefit obligation at year end	$ 105,600	$ 113,300
Weighted-average assumptions used to determine benefit obligations at period end:
Discount rate (as a percent)	4.38%	4.01%
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	$ 280
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	$ (19,747)	(19,122)
European Plans
Pensions
Number of plans which do not allow existing participants to continue to earn benefits | plan	1
Settlement charge	$ 199		279
Change in Projected Benefit Obligations
Projected benefit obligation as of beginning of year	42,886	42,367
Service cost	288	342	314
Interest cost	1,250	1,653	1,511
Employee contributions	71	88
Actuarial (gain) loss	(64)	4,097
Benefits paid	(1,091)	(1,781)
Settlement	(1,383)
Foreign currency exchange rate changes	(2,756)	(3,880)
Projected benefit obligation as of end of year	39,201	42,886	42,367
Change in Plan Assets
Fair value of plan assets as of beginning of year	31,025	29,586
Actual return on plan assets	646	3,529
Employer contributions	1,774	1,979
Employee contributions	71	88
Benefits paid	(1,091)	(1,781)
Settlement	(1,383)
Foreign currency exchange rate changes	(1,691)	(2,376)
Fair value of plan assets as of end of year	29,351	31,025	$ 29,586
Funded status as of end of year	(9,850)	(11,861)
Amounts recognized in the Balance Sheets:
Net amount recognized	(9,850)	(11,861)
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Accumulated net actuarial loss	8,039	8,076
Net amount recognized, before tax effect	8,039	8,076
Accumulated benefit obligation at year end	$ 37,100	$ 41,300
Weighted-average assumptions used to determine benefit obligations at period end:
Discount rate (as a percent)	3.15%	3.00%
Rate of increase in compensation levels (as a percent)	3.37%	3.38%
European Plans | Other assets
Amounts recognized in the Balance Sheets:
Noncurrent asset	$ 1,258	$ 1,046
European Plans | Payroll and benefits payable
Amounts recognized in the Balance Sheets:
Current liability	(450)	(498)
European Plans | Accrued pension and other liabilities
Amounts recognized in the Balance Sheets:
Noncurrent liability	$ (10,658)	$ (12,409)