Fair Value Measurements - Other Hedges (Details) (USD $)			3 Months Ended																		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Foreign currency forward contracts	Mar. 31, 2013 Foreign currency forward contracts	Mar. 31, 2014 Other Current Assets	Dec. 31, 2013 Other Current Assets	Mar. 31, 2014 Other Current Liabilities	Dec. 31, 2013 Other Current Liabilities	Mar. 31, 2014 Hedges designated as hedging instruments Cash flow hedges	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges	Mar. 31, 2014 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Assets	Mar. 31, 2014 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Dec. 31, 2013 Hedges designated as hedging instruments Cash flow hedges Other Current Liabilities	Mar. 31, 2014 Other hedges not receiving hedge accounting	Dec. 31, 2013 Other hedges not receiving hedge accounting	Mar. 31, 2014 Other hedges not receiving hedge accounting Other Current Assets	Dec. 31, 2013 Other hedges not receiving hedge accounting Other Current Assets	Mar. 31, 2014 Other hedges not receiving hedge accounting Other Current Liabilities	Dec. 31, 2013 Other hedges not receiving hedge accounting Other Current Liabilities	Mar. 31, 2014 Other Expense	Mar. 31, 2013 Other Expense
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net foreign currency gain (loss)																					$ 0	$ 500,000
Gain (loss) on foreign currency contracts			(200,000)	300,000
Notional Amount	124,500,000	163,200,000							102,000,000	133,800,000					22,500,000	29,400,000
Derivative assets fair value					2,800,000	5,100,000					2,800,000	5,100,000					0	0
Derivative liabilities fair value							$ (700,000)	$ (700,000)					$ (700,000)	$ (700,000)					$ 0	$ 0