Fair Value and Derivative Financial Instruments Fair Value and Derivative Financial Instruments (Fair Value Measurements of Derivative Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivative Assets [Abstract]
Derivative assets	$ 459	$ 494
Derivative Liabilities [Abstract]
Derivative liabilities	2,007	3,938
Currency Swap [Member] | Not Designated as Hedging Instrument [Member] | Other current assets [Member]
Derivative Assets [Abstract]
Derivative assets	0	494
Currency Swap [Member] | Not Designated as Hedging Instrument [Member] | Other accrued liabilities [Member]
Derivative Liabilities [Abstract]
Derivative liabilities, current	154	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other current assets [Member]
Derivative Assets [Abstract]
Derivative assets	459	0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other accrued liabilities [Member]
Derivative Liabilities [Abstract]
Derivative liabilities, current	1,853	3,809
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative Liabilities [Abstract]
Derivative liabilities, non-current	$ 0	$ 129