Fair Value and Derivative Financial Instruments Fair Value and Derivative Financial Instruments (loss related to foreign exchange swaps recognized in the statements of operations) (Details) (Currency Swap [Member], Other, net [Member], Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Currency Swap [Member] | Other, net [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange swaps not designated as hedging instruments, gain (loss), net	$ 339	$ 481	$ (242)	$ 168