Derivative Instruments (Narrative) (Details)	6 Months Ended			6 Months Ended
	Jun. 30, 2012 Euro Forward Contracts [Member] USD ($)	Jun. 30, 2012 Euro Forward Contracts [Member] EUR (€)	Jun. 30, 2011 Euro Forward Contracts [Member] contract	Jun. 30, 2012 Interest Rate Swap Agreements [Member] USD ($)	Jun. 30, 2011 Interest Rate Swap Agreements [Member] USD ($)
Derivatives, Fair Value [Line Items]
Notional amount of derivatives		€ 45,000,000		$ 198,500,000	$ 30,000,000
Cash flow hedges expected to be reclassified to earnings	2,700,000			200,000
Number of derivatives held			0
Derivative instruments maturity range, months	6 months			6 months
Hedge ineffectiveness recorded to income	0			0	0
Derivative Liability, Notional Amount	3,600,000
Derivative liability				$ 200,000	$ 300,000