Derivative Instruments (Narrative) (Details)	9 Months Ended			9 Months Ended
	Sep. 30, 2012 Euro Forward Contracts [Member] USD ($)	Sep. 30, 2012 Euro Forward Contracts [Member] EUR (€)	Sep. 30, 2011 Euro Forward Contracts [Member] contract	Sep. 30, 2012 Interest Rate Swap Agreements [Member] USD ($)	Sep. 30, 2011 Interest Rate Swap Agreements [Member] swap_agreement
Derivatives, Fair Value [Line Items]
Notional amount of derivatives		€ 22,500,000		$ 198,000,000
Cash flow hedges expected to be reclassified to earnings	1,100,000			100,000
Hedge ineffectiveness recorded to income	0			0
Derivative Liability, Notional Amount	1,400,000
Number of derivatives held			0		0
Derivative instruments maturity range, months	3 months			3 months
Derivative liability				$ 100,000