Financial Instruments (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2013 Designated as Hedging Instrument [Member] USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2013 Not Designated as Hedging Instrument [Member] USD ($)	Sep. 30, 2014 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] USD ($)	Sep. 30, 2014 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] CHF	Sep. 30, 2014 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] Other Liabilities [Member] USD ($)	Dec. 31, 2013 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Prepaid and Other Current Assets [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Prepaid and Other Current Assets [Member] USD ($)	Sep. 30, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Other Accrued Expenses [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Other Accrued Expenses [Member] USD ($)	Dec. 31, 2013 Note due 2020 [Member] EUR (€)	Dec. 31, 2013 Note due 2020 [Member] Designated as Hedging Instrument [Member] EUR (€)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount			$ 25,111,000	$ 33,216,000	$ 56,005,000	$ 104,688,000	$ 50,000,000	65,100,000
Fair Value - Asset											814,000	879,000
Fair Value - Liability									18,250,000	23,716,000			822,000	168,000
Debt Instrument, Face Amount															300,000,000	300,000,000
Gain (loss) on euro net investment hedge, gross	26,357,000	29,722,000
Gain (Loss) on euro net investment hedge, net of tax	$ 17,132,000	$ 19,319,000