Pensions and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2004
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets		$ 143	$ 802
Included in "Accrued Payroll"		(7,717)	0
Accrued pension and other postretirement costs		(344,961)	(319,136)
Total actuarial items		212,852	172,361
Components of actuarial items [Abstract]
Total actuarial items		212,852	172,361
Components of net periodic pension cost [Abstract]
Amounts that will be amortized from accumulated other comprehensive loss into net periodic pension cost during next fiscal year	20,100
Other postretirement benefits [Abstract]
Number of executives with formal employment agreements					6
Other retirement obligations [Abstract]
Company's matching expense for 401(k) savings plans		4,230	4,985	5,399
Liabilities recorded for post-employment benefit obligations to certain terminated employees related to acquisitions		5,827	6,818
Accrued liabilities for post-employment benefit obligations to certain terminated employees related to acquisitions		1,498	1,823
Deferred Compensation [Member]
Defined benefit pension plans [Abstract]
Assets held in trust		12,310	11,830
Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust		16,608	14,423
Dr. Felix Zandman [Member]
Defined benefit pension plans [Abstract]
Deferred compensation arrangement, annual retirement benefit to surviving spouse		614
Dr. Felix Zandman [Member] | Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust		4,833	5,445
Equity Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations		60.00%
Debt Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations		40.00%
U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year		322,527	303,613
Service cost		0	0	0
Interest cost		15,699	16,332	16,341
Plan amendments and initiations		0	0
Actuarial (gains) losses		35,467	20,320
Benefits paid		(18,628)	(17,738)
Currency translation		0	0
Benefit obligation at end of year		355,065	322,527	303,613
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year		239,045	238,523
Actual return on plan assets		27,763	1,117
Company contributions		17,686	17,143
Benefits paid		(18,628)	(17,738)
Currency translation		0	0
Fair value of plan assets at end of year		265,866	239,045	238,523
Funded status at end of year		(89,199)	(83,482)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in "Accrued Payroll"		(83)	0
Accrued pension and other postretirement costs		(89,116)	(83,482)
Total actuarial items		146,525	135,009
Total		57,326	51,527
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)		144,324	130,608
Unamortized prior service (credit) cost		2,201	4,401
Total actuarial items		146,525	135,009
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans		355,065	322,527
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation		355,065	322,527
Accumulated benefit obligation		355,065	322,527
Fair value of plan assets		265,866	239,045
Components of net periodic pension cost [Abstract]
Net service cost		0	0	0
Interest cost		15,699	16,332	16,341
Expected return on plan assets		(18,972)	(19,082)	(18,098)
Amortization of actuarial losses		12,960	9,006	9,315
Amortization of prior service (credit) cost		2,200	2,361	1,477
Curtailment and settlement losses (gains)		0	148	0
Net periodic benefit cost		11,887	8,765	9,035
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)		4.00%	5.00%
Rate of compensation increase (in hundredths)		0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)		5.00%	5.50%
Rate of compensation increase (in hundredths)		0.00%	0.00%
Expected return on plan assets (in hundredths)		8.00%	8.00%
Estimated future benefit payments [Abstract]
2013		18,595
2014		24,960
2015		20,624
2016		20,960
2017		20,229
2018-2022		107,853
Estimated future employer contributions to U.S. defined benefit pension plans in next fiscal year, minimum	15,000
Estimated future employer contributions to U.S. defined benefit pension plans in next fiscal year, maximum	20,000
U.S. Pension Plans [Member] | Cash and Cash Equivalents [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		5,850	338
U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		153,829	138,379
U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		99,669	93,842
Non-U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year		243,966	231,870
Service cost		3,247	3,197	3,027
Interest cost		9,374	10,366	10,774
Plan amendments and initiations		67	531
Actuarial (gains) losses		29,957	14,986
Benefits paid		(11,456)	(12,763)
Currency translation		7,293	(4,220)
Benefit obligation at end of year		282,448	243,966	231,870
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year		35,544	32,461
Actual return on plan assets		2,795	830
Company contributions		17,905	15,325
Benefits paid		(11,456)	(12,763)
Currency translation		1,792	(309)
Fair value of plan assets at end of year		46,580	35,544	32,461
Funded status at end of year		(235,868)	(208,422)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets		143	802
Included in "Accrued Payroll"		(6,997)	0
Accrued pension and other postretirement costs		(229,014)	(209,224)
Total actuarial items		71,459	41,494
Total		(164,409)	(166,928)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)		71,459	41,494
Unamortized prior service (credit) cost		0	0
Total actuarial items		71,459	41,494
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans		261,557	225,381
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation		255,772	236,323
Accumulated benefit obligation		240,816	221,637
Fair value of plan assets		20,436	27,098
Components of net periodic pension cost [Abstract]
Net service cost		3,247	3,197	3,027
Interest cost		9,374	10,366	10,774
Expected return on plan assets		(1,667)	(1,651)	(1,629)
Amortization of actuarial losses		1,681	993	160
Amortization of prior service (credit) cost		60	531	163
Curtailment and settlement losses (gains)		0	0	0
Net periodic benefit cost		12,695	13,436	12,495
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)		3.04%	3.96%
Rate of compensation increase (in hundredths)		1.48%	2.31%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)		3.96%	4.50%
Rate of compensation increase (in hundredths)		2.31%	2.19%
Expected return on plan assets (in hundredths)		4.47%	4.26%
Estimated future benefit payments [Abstract]
2013		12,225
2014		14,382
2015		13,580
2016		14,315
2017		16,839
2018-2022		86,879
Non-U.S. Pension Plans [Member] | Cash and Cash Equivalents [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		23,255	18,556
Non-U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		8,888	6,815
Non-U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year		14,437	10,173
U.S. Postretirement Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year		10,924	10,633
Service cost		106	77	95
Interest cost		366	547	640
Plan amendments and initiations		(3,297)	0
Actuarial (gains) losses		660	675
Benefits paid		(602)	(1,008)
Currency translation		0	0
Benefit obligation at end of year		8,157	10,924	10,633
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year		0
Benefits paid		(602)	(1,008)
Fair value of plan assets at end of year		0	0
Funded status at end of year		(8,157)	(10,924)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in "Accrued Payroll"		(637)	0
Accrued pension and other postretirement costs		(7,520)	(10,924)
Total actuarial items		(5,937)	(4,142)
Total		(14,094)	(15,066)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)		(1,657)	(2,309)
Unamortized prior service (credit) cost		(4,280)	(1,865)
Unrecognized net transition obligation		0	32
Total actuarial items		(5,937)	(4,142)
Components of net periodic pension cost [Abstract]
Net service cost		106	77	95
Interest cost		366	547	640
Amortization of actuarial losses		(76)	(315)	(244)
Amortization of prior service (credit) cost		(798)	(431)	(434)
Amortization of transition obligation		32	47	61
Net periodic benefit cost		(370)	(75)	118
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)		4.00%	5.00%
Rate of compensation increase (in hundredths)		0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)		5.00%	5.50%
Rate of compensation increase (in hundredths)		0.00%	0.00%
Estimated future benefit payments [Abstract]
2013		637
2014		654
2015		675
2016		683
2017		669
2018-2022		2,970
Other postretirement benefits [Abstract]
Number of unfunded non-pension postretirement plans		2
Non-U.S. Postretirement Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year		5,972	5,801
Service cost		253	275	255
Interest cost		286	282	291
Plan amendments and initiations		0	0
Actuarial (gains) losses		1,022	341
Benefits paid		(704)	(618)
Currency translation		135	(109)
Benefit obligation at end of year		6,964	5,972	5,801
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year		0
Benefits paid		(704)	(618)
Fair value of plan assets at end of year		0	0
Funded status at end of year		(6,964)	(5,972)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Accrued pension and other postretirement costs		(6,964)	(5,972)
Total actuarial items		805	0
Total		(6,159)	(5,972)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)		805	0
Unamortized prior service (credit) cost		0	0
Unrecognized net transition obligation		0	0
Total actuarial items		805	0
Components of net periodic pension cost [Abstract]
Net service cost		253	275	255
Interest cost		286	282	291
Amortization of actuarial losses		0	0	0
Amortization of prior service (credit) cost		0	0	0
Amortization of transition obligation		0	0	0
Net periodic benefit cost		539	557	546
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)		3.80%	5.09%
Rate of compensation increase (in hundredths)		3.20%	3.22%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)		5.09%	4.80%
Rate of compensation increase (in hundredths)		3.22%	3.00%
Estimated future benefit payments [Abstract]
2013		444
2014		327
2015		333
2016		402
2017		497
2018-2022		3,470
Other postretirement benefits [Abstract]
Number of European subsidiaries with unfunded non-pension postretirement plans		2
Other Retirement Obligations [Member]
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Accrued pension and other postretirement costs		$ (12,347)	$ (9,534)