Derivative Financial Instruments Derivative Financial Instruments (Details textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Net gain (loss)	$ (2,000,000)	$ 1,500,000
Maturities of foreign currency forward contracts	5 months 0 days
Level 2 | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	2,200,000
Level 2 | Interest Rate Swap [Member] | Other Current Assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3,200,000
Level 2 | Interest Rate Swap [Member] | Other Current Liabilities
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ 1,000,000
Term loan facility [Member]
Derivative [Line Items]
Effective interest rate	2.49%