Pensions and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	$ 15,965	$ 143
Included in "Accrued Payroll"	(8,333)	(7,717)
Accrued pension and other postretirement costs	(287,901)	(344,961)
Accumulated other comprehensive loss	141,500	212,852
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	9,900
Estimated future benefit payments [Abstract]
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
Other retirement obligations [Abstract]
Company's matching expense for 401(k) savings plans	5,276	4,230	4,985
Liabilities recorded for post-employment benefit obligations to certain terminated employees related to acquisitions	4,727	5,827
Accrued liabilities for post-employment benefit obligations to certain terminated employees related to acquisitions	1,358	1,498
Deferred Compensation [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	14,093	12,310
Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	18,678	16,608
Dr. Felix Zandman [Member] | Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	4,221	4,833
Deferred compensation arrangement, annual retirement benefit to surviving spouse	614
Equity Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	20.00%	60.00%
Debt Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	80.00%	40.00%
U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year	355,065	322,527
Service cost	0	0	0
Interest cost	13,882	15,699	16,332
Plan amendments and initiations	0	0
Actuarial (gains) losses	(34,703)	35,467
Benefits paid	(18,871)	(18,628)
Currency translation	0	0
Benefit obligation at end of year	315,373	355,065	322,527
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year	265,866	239,045
Actual return on plan assets	31,018	27,763
Company contributions	17,620	17,686
Benefits paid	(18,871)	(18,628)
Currency translation	0	0
Fair value of plan assets at end of year	295,633	265,866	239,045
Funded status at end of year	(19,740)	(89,199)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	15,708	0
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(51)	(83)
Included in "Accrued Payroll"	(51)	(83)
Accrued pension and other postretirement costs	(35,397)	(89,116)
Total actuarial items	84,384	146,525
Accumulated other comprehensive loss	84,384	146,525
Total	64,644	57,326
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	83,161	144,324
Unamortized prior service (credit) cost	1,223	2,201
Total actuarial items	84,384	146,525
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans	315,373	355,065
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation	35,448	355,065
Accumulated benefit obligation	35,448	355,065
Fair value of plan assets	0	265,866
Components of net periodic pension cost [Abstract]
Net service cost	0	0	0
Interest cost	13,882	15,699	16,332
Expected return on plan assets	(19,124)	(18,972)	(19,082)
Amortization of actuarial losses	14,566	12,960	9,006
Amortization of prior service (credit) cost	978	2,200	2,361
Curtailment and settlement losses (gains)	0	0	148
Net periodic benefit cost	10,302	11,887	8,765
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	5.00%	4.00%
Rate of compensation increase (in hundredths)	0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.00%	5.00%
Rate of compensation increase (in hundredths)	0.00%	0.00%
Expected return on plan assets (in hundredths)	7.25%	8.00%
Estimated future benefit payments [Abstract]
2014	19,128
2015	19,451
2016	19,780
2017	26,378
2018	21,926
2019-2023	109,815
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	171	5,850
U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	51,666	153,829
U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	241,827	99,669
Non-U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year	282,448	243,966
Service cost	3,499	3,247	3,197
Interest cost	8,150	9,374	10,366
Plan amendments and initiations	23	67
Actuarial (gains) losses	(5,134)	29,957
Benefits paid	(13,980)	(11,456)
Currency translation	5,520	7,293
Benefit obligation at end of year	280,526	282,448	243,966
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year	46,580	35,544
Actual return on plan assets	2,482	2,795
Company contributions	14,781	17,905
Benefits paid	(13,980)	(11,456)
Currency translation	(1,004)	1,792
Fair value of plan assets at end of year	48,859	46,580	35,544
Funded status at end of year	(231,667)	(235,868)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	257	143
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(7,644)	(6,997)
Included in "Accrued Payroll"	(7,644)	(6,997)
Accrued pension and other postretirement costs	(224,280)	(229,014)
Total actuarial items	61,652	71,459
Accumulated other comprehensive loss	61,652	71,459
Total	(170,015)	(164,409)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	61,652	71,459
Unamortized prior service (credit) cost	0	0
Total actuarial items	61,652	71,459
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans	260,558	261,557
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation	251,569	255,772
Accumulated benefit obligation	238,419	240,816
Fair value of plan assets	21,356	20,436
Components of net periodic pension cost [Abstract]
Net service cost	3,499	3,247	3,197
Interest cost	8,150	9,374	10,366
Expected return on plan assets	(2,084)	(1,667)	(1,651)
Amortization of actuarial losses	3,407	1,681	993
Amortization of prior service (credit) cost	(12)	60	531
Curtailment and settlement losses (gains)	959	0	0
Net periodic benefit cost	13,919	12,695	13,436
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	3.11%	3.04%
Rate of compensation increase (in hundredths)	1.99%	1.48%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)	3.04%	3.96%
Rate of compensation increase (in hundredths)	1.48%	2.31%
Expected return on plan assets (in hundredths)	4.44%	4.47%
Estimated future benefit payments [Abstract]
2014	14,249
2015	14,082
2016	14,501
2017	16,769
2018	15,292
2019-2023	90,491
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	22,831	23,255
Non-U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	9,911	8,888
Non-U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	16,117	14,437
U.S. Postretirement Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year	8,157	10,924
Service cost	111	106	77
Interest cost	314	366	547
Plan amendments and initiations	0	(3,297)
Actuarial (gains) losses	(639)	660
Benefits paid	(602)	(602)
Currency translation	0	0
Benefit obligation at end of year	7,341	8,157	10,924
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year	0
Benefits paid	(602)	(602)
Fair value of plan assets at end of year	0	0
Funded status at end of year	(7,341)	(8,157)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(638)	(637)
Included in "Accrued Payroll"	(638)	(637)
Accrued pension and other postretirement costs	(6,703)	(7,520)
Total actuarial items	(5,782)	(5,937)
Accumulated other comprehensive loss	(5,782)	(5,937)
Total	(13,123)	(14,094)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	(2,301)	(1,657)
Unamortized prior service (credit) cost	(3,481)	(4,280)
Total actuarial items	(5,782)	(5,937)
Components of net periodic pension cost [Abstract]
Net service cost	111	106	77
Interest cost	314	366	547
Amortization of actuarial losses	4	(76)	(315)
Amortization of prior service (credit) cost	(798)	(798)	(431)
Amortization of transition obligation	0	32	47
Net periodic benefit cost	(369)	(370)	(75)
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	5.00%	4.00%
Rate of compensation increase (in hundredths)	0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.00%	5.00%
Rate of compensation increase (in hundredths)	0.00%	0.00%
Estimated future benefit payments [Abstract]
2014	638
2015	720
2016	704
2017	693
2018	678
2019-2023	2,940
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	6,964	5,972
Service cost	299	253	275
Interest cost	257	286	282
Plan amendments and initiations	0	0
Actuarial (gains) losses	398	1,022
Benefits paid	(740)	(704)
Currency translation	326	135
Benefit obligation at end of year	7,504	6,964	5,972
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year	0
Benefits paid	(740)	(704)
Fair value of plan assets at end of year	0	0
Funded status at end of year	(7,504)	(6,964)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	0	0
Accrued pension and other postretirement costs	(7,504)	(6,964)
Total actuarial items	1,246	805
Accumulated other comprehensive loss	1,246	805
Total	(6,258)	(6,159)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	1,246	805
Unamortized prior service (credit) cost	0	0
Total actuarial items	1,246	805
Components of net periodic pension cost [Abstract]
Net service cost	299	253	275
Interest cost	257	286	282
Amortization of actuarial losses	8	0	0
Amortization of prior service (credit) cost	0	0	0
Amortization of transition obligation	0	0	0
Net periodic benefit cost	564	539	557
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	3.44%	3.80%
Rate of compensation increase (in hundredths)	3.19%	3.20%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)	3.80%	5.09%
Rate of compensation increase (in hundredths)	3.20%	3.22%
Estimated future benefit payments [Abstract]
2014	420
2015	267
2016	329
2017	453
2018	551
2019-2023	3,650
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	$ (14,017)	$ (12,347)