Derivative Instruments - Balance Sheet Location (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross derivative asset, fair value	$ 0	$ 3,763
Gross derivative liability, fair value	0	0
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross derivative asset, fair value	0	0
Gross derivative liability, fair value	7,252	2,010
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross derivative asset, fair value	1,668	333
Gross derivative liability, fair value	0	0
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross derivative asset, fair value	0	0
Gross derivative liability, fair value	$ 8,383	$ 1,992