Derivative Instruments (Narrative) (Details)	3 Months Ended			3 Months Ended
	Mar. 31, 2012 Euro Forward Contracts [Member] USD ($) contract	Mar. 31, 2011 Euro Forward Contracts [Member] USD ($)	Mar. 31, 2012 Euro Forward Contracts [Member] EUR (€)	Mar. 31, 2012 Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2011 Interest Rate Swap Agreements [Member] USD ($)
Derivatives, Fair Value [Line Items]
Notional amount of derivatives			€ 67,500,000	$ 199,000,000	$ 60,000,000
Cash flow hedges expected to be reclassified to earnings	900,000			300,000
Number of derivatives held	0
Derivative instruments maturity range, months	9 months			9 months
Hedge ineffectiveness recorded to income	0	0		0	0
Derivative Liability, Notional Amount	1,100,000
Derivative liability				$ 300,000	$ 300,000