Derivative Instruments - Balance Sheet Location (Details) (Foreign Exchange Contract [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	$ 2,171	$ 5,744
Gross amounts offset in the balance sheet	(698)	(3,081)
Net amounts presented in other current assets	1,473	2,663
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	7,278	4,289
Gross amounts offset in the balance sheet	(4,692)	(3,281)
Net amounts presented in other current liabilities	2,586	1,008
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	0	3,019
Gross amounts offset in the balance sheet	0	(1,492)
Net amounts presented in other current assets	0	1,527
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	4,362	0
Gross amounts offset in the balance sheet	(3,042)	0
Net amounts presented in other current liabilities	1,320	0
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	2,171	2,725
Gross amounts offset in the balance sheet	(698)	(1,589)
Net amounts presented in other current assets	1,473	1,136
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	2,916	4,289
Gross amounts offset in the balance sheet	(1,650)	(3,281)
Net amounts presented in other current liabilities	$ 1,266	$ 1,008