Pension Plans and Other Postretirement Benefits Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans, as well as Summary of Significant Assumptions for Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
U.S. Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 682,839		$ 729,652
Service cost	1,028		1,233		$ 7,029
Interest cost	30,514		30,235		30,491
Plan amendments	0		0
Actuarial loss (gain)	7,357		(54,140)
Benefits paid	(56,050)		(37,512)
Acquisitions	0		13,371
Divestitures	0		0
Reclass to liabilities held for sale	0		0
Employee contributions	0		0
Foreign exchange gain	0		0
Settlements/curtailments	0		0
Other	0		0
Benefit obligation, ending balance	665,688		682,839		729,652
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	555,084		598,250
Actual return on plan assets	37,725		(16,306)
Employer contributions	1,323		1,398
Benefits paid	(56,050)		(37,512)
Acquisitions	0		9,254
Employee contributions	0		0
Foreign exchange loss	0		0
Settlements/curtailments	0		0
Other	0		0
Fair value of plan assets, Ending Balance	538,082		555,084		598,250
Funded status	(127,606)		(127,755)
Current liabilities (accrued expenses)	(1,100)		(1,110)
Noncurrent liabilities (pension benefits)	(126,506)		(126,645)
Net pension liability	(127,606)		(127,755)
Prior service benefit	(136)		(211)
Net amount recognized	$ (136)		$ (211)
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount Rate	4.43%		4.67%
Rate of compensation increase	0.00%		0.00%
Foreign Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 245,747		$ 53,112
Service cost	3,133		3,909		1,746
Interest cost	6,570		6,405		1,571
Plan amendments	0		864
Actuarial loss (gain)	28,083		(30,978)
Benefits paid	(9,793)		(11,283)
Acquisitions	0		270,618
Divestitures	(6,372)		0
Reclass to liabilities held for sale	0		(26,608)
Employee contributions	245		256
Foreign exchange gain	(21,724)		(20,105)
Settlements/curtailments	(427)		(161)
Other	818		(282)
Benefit obligation, ending balance	246,280		245,747		53,112
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	64,911		9,444
Actual return on plan assets	12,534		630
Employer contributions	10,911		11,864
Benefits paid	(9,793)		(11,283)
Acquisitions	0		56,418
Employee contributions	245		256
Foreign exchange loss	(10,492)		(2,189)
Settlements/curtailments	0		(161)
Other	559		(68)
Fair value of plan assets, Ending Balance	68,875		64,911		9,444
Funded status	(177,405)		(180,836)
Current liabilities (accrued expenses)	(5,216)		(7,498)
Noncurrent liabilities (pension benefits)	(172,189)		(173,338)
Net pension liability	(177,405)		(180,836)
Prior service benefit	(322)		(1,046)
Net amount recognized	$ (322)		$ (1,046)
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount Rate	2.00%		2.76%
Rate of compensation increase	3.18%		3.16%
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning balance	$ 56,499		$ 64,500
Service cost	115		137		216
Interest cost	2,483		2,573		3,040
Actuarial loss (gain)	1,529		(5,690)
Benefits paid	(4,485)		(5,021)
Benefit obligation, ending balance	56,141		56,499		64,500
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	3,292	[1]	4,439
Actual return on plan assets	442		280
Employer contributions	2,983		3,594
Benefits paid	(4,485)		(5,021)
Fair value of plan assets, Ending Balance	2,232	[1]	3,292	[1]	$ 4,439
Funded status	(53,909)		(53,207)
Current liabilities (accrued expenses)	(3,371)		(3,560)
Noncurrent liabilities (pension benefits)	(50,538)		(49,647)
Net pension liability	(53,909)		(53,207)
Prior service benefit	143		239
Net amount recognized	$ 143		$ 239
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount Rate	4.35%		4.59%
Rate of compensation increase	3.50%		3.50%

[1] See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets