Financial Instruments (Details) SFr in Thousands, $ in Thousands, € in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 CHF (SFr)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Gain (loss) on euro net investment hedge, gross	$ 3,631	$ 31,846	$ 27,957	$ 35,188
Foreign currency translation adjustments, tax	(1,271)	(11,146)	(9,785)	(12,316)
Gain (Loss) on euro net investment hedge, net of tax	2,360	20,700	18,172	22,872
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount						$ 33,026		$ 47,047
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount						79,858		52,392
Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on euro net investment hedge, gross	3,331	5,489	(718)	5,466
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount					SFr 65,100	50,000
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Liability						16,285		15,567
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Asset						1,182		973
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Fair Value - Liability						$ 505		$ 810
Note due 2020 [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on euro net investment hedge, gross	$ 300	$ 26,357	$ 28,675	$ 29,722
Note due 2020 [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Face Amount | €							€ 300.0