Pension (Projected Benefit Obligation and Fair Value of Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plan
Change in projected benefit obligation:
Benefit obligation, beginning of year	$ 471,463	$ 412,828
Service cost (benefits earned during the period)	7,330	5,928	$ 7,601
Interest cost on projected benefit obligation	19,047	20,944	19,074
Exchange rate fluctuations	(13,948)	(14,668)
Actuarial (gain) loss	(15,691)	79,117
Plan participants' contributions	1,359	1,249
Plan amendments	(4,354)	(780)
Curtailment effect	(7,414)	0
Settlements paid	(74,581)	(12,825)
Benefits paid	(21,433)	(20,330)
Benefit obligation, end of year	361,778	471,463	412,828
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	414,361	403,249
Actual return on plan assets	(6,309)	45,985
Exchange rate fluctuations	(7,761)	(9,328)
Employer contributions	10,548	6,361
Plan participants' contributions	1,359	1,249
Settlements paid	(74,581)	(12,825)
Benefits paid	(21,433)	(20,330)
Fair value of plan assets, end of year	$ 316,184	$ 414,361	403,249
Funded status of plan:
Funded ratio	87.40%	87.90%
Funded status and net accrued pension benefit asset (cost)	$ (45,594)	$ (57,102)
U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	351,477	310,109
Service cost (benefits earned during the period)	4,365	3,664	4,739
Interest cost on projected benefit obligation	14,715	15,378	14,093
Exchange rate fluctuations	0	0
Actuarial (gain) loss	(26,796)	51,066
Plan participants' contributions	0	0
Plan amendments	0	0
Curtailment effect	0	0
Settlements paid	(96)	(12,825)
Benefits paid	(17,802)	(15,915)
Benefit obligation, end of year	325,863	351,477	310,109
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	340,082	332,827
Actual return on plan assets	(6,096)	33,342
Exchange rate fluctuations	0	0
Employer contributions	96	2,653
Plan participants' contributions	0	0
Settlements paid	(96)	(12,825)
Benefits paid	(17,802)	(15,915)
Fair value of plan assets, end of year	$ 316,184	$ 340,082	332,827
Funded status of plan:
Funded ratio	97.00%	96.80%
Funded status and net accrued pension benefit asset (cost)	$ (9,679)	$ (11,395)
Non-U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	119,986	102,719
Service cost (benefits earned during the period)	2,965	2,264	2,862
Interest cost on projected benefit obligation	4,332	5,566	4,981
Exchange rate fluctuations	(13,948)	(14,668)
Actuarial (gain) loss	11,105	28,051
Plan participants' contributions	1,359	1,249
Plan amendments	(4,354)	(780)
Curtailment effect	(7,414)	0
Settlements paid	(74,485)	0
Benefits paid	(3,631)	(4,415)
Benefit obligation, end of year	35,915	119,986	102,719
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	74,279	70,422
Actual return on plan assets	(213)	12,643
Exchange rate fluctuations	(7,761)	(9,328)
Employer contributions	10,452	3,708
Plan participants' contributions	1,359	1,249
Settlements paid	(74,485)	0
Benefits paid	(3,631)	(4,415)
Fair value of plan assets, end of year	$ 0	$ 74,279	$ 70,422
Funded status of plan:
Funded ratio	0.00%	61.90%
Funded status and net accrued pension benefit asset (cost)	$ (35,915)	$ (45,707)