Hedging Hedging - Foreign Currency (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign currency cash flow hedge unrealized losses that would be reclassified during next 12 months	$ 13,000,000		$ 13,000,000
Gains (losses) on 30-day euro forward contracts	(1,781,000)	8,826,000	(1,021,000)	(908,000)
Gains (losses) from fluctuations in the value of the net monetary assets exposed to euro exchange rates	$ 4,129,000	$ (13,036,000)	$ (3,281,000)	$ (1,246,000)