Pension (Projected Benefit Obligation and Fair Value of Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plan
Change in projected benefit obligation:
Benefit obligation, beginning of year	$ 361,778	$ 471,463
Service cost (benefits earned during the period)	4,943	7,330	$ 5,928
Interest cost on projected benefit obligation	17,557	19,047	20,944
Exchange rate fluctuations	(5,821)	(13,948)
Actuarial (gain) loss	8,631	(15,691)
Plan participants' contributions	0	1,359
Plan amendments	0	(4,354)
Curtailment effect	0	(7,414)
Settlements paid	(259)	(74,581)
Benefits Paid	22,020	21,433
Benefit obligation, end of year	364,809	361,778	471,463
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	316,184	414,361
Actual return on plan assets	20,974	(6,309)
Exchange rate fluctuations	0	(7,761)
Employer contributions	3,535	10,548
Plan participants' contributions	0	1,359
Settlements paid	(259)	(74,581)
Benefits paid	(22,020)	(21,433)
Fair value of plan assets, end of year	$ 318,414	$ 316,184	414,361
Funded status of plan:
Funded ratio	87.30%	87.40%
Funded status and net accrued pension benefit asset (cost)	$ (46,395)	$ (45,594)
U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	325,863	351,477
Service cost (benefits earned during the period)	3,717	4,365	3,664
Interest cost on projected benefit obligation	14,963	14,715	15,378
Exchange rate fluctuations	0	0
Actuarial (gain) loss	11,108	(26,796)
Plan participants' contributions	0	0
Plan amendments	0	0
Curtailment effect	0	0
Settlements paid	(259)	(96)
Benefits Paid	18,744	17,802
Benefit obligation, end of year	336,648	325,863	351,477
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	316,184	340,082
Actual return on plan assets	20,974	(6,096)
Exchange rate fluctuations	0	0
Employer contributions	259	96
Plan participants' contributions	0	0
Settlements paid	(259)	(96)
Benefits paid	(18,744)	(17,802)
Fair value of plan assets, end of year	$ 318,414	$ 316,184	340,082
Funded status of plan:
Funded ratio	94.60%	97.00%
Funded status and net accrued pension benefit asset (cost)	$ (18,234)	$ (9,679)
Non-U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	35,915	119,986
Service cost (benefits earned during the period)	1,226	2,965	2,264
Interest cost on projected benefit obligation	2,594	4,332	5,566
Exchange rate fluctuations	(5,821)	(13,948)
Actuarial (gain) loss	(2,477)	11,105
Plan participants' contributions	0	1,359
Plan amendments	0	(4,354)
Curtailment effect	0	(7,414)
Settlements paid	0	(74,485)
Benefits Paid	3,276	3,631
Benefit obligation, end of year	28,161	35,915	119,986
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	0	74,279
Actual return on plan assets	0	(213)
Exchange rate fluctuations	0	(7,761)
Employer contributions	3,276	10,452
Plan participants' contributions	0	1,359
Settlements paid	0	(74,485)
Benefits paid	(3,276)	(3,631)
Fair value of plan assets, end of year	$ 0	$ 0	$ 74,279
Funded status of plan:
Funded ratio	0.00%	0.00%
Funded status and net accrued pension benefit asset (cost)	$ (28,161)	$ (35,915)