Derivative Instruments - Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	$ 3,453	$ 2,456
Gross amounts offset in the balance sheet	(1,181)	(670)
Net amounts presented in other current assets	2,272	1,786
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	1,330	8,012
Gross amounts offset in the balance sheet	(71)	(3,487)
Net amounts presented in other current liabilities	1,259	4,525
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	2,908	0
Gross amounts offset in the balance sheet	(943)	0
Net amounts presented in other current assets	1,965	0
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	0	3,283
Gross amounts offset in the balance sheet	0	(865)
Net amounts presented in other current liabilities	0	2,418
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized assets	545	2,456
Gross amounts offset in the balance sheet	(238)	(670)
Net amounts presented in other current assets	307	1,786
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	1,330	4,729
Gross amounts offset in the balance sheet	(71)	(2,622)
Net amounts presented in other current liabilities	$ 1,259	$ 2,107