Derivative Financial Instruments Derivative Financial Instruments (Details textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Net gain (loss)	$ (2,800,000)	$ 1,400,000	$ (5,700,000)	$ (2,100,000)
Maturities of foreign currency forward contracts			6 months 0 days
Level 2 | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	1,900,000		1,900,000
Level 2 | Interest Rate Swap [Member] | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,800,000		2,800,000
Level 2 | Interest Rate Swap [Member] | Other current liabilities
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ 900,000		$ 900,000
Term loan facility [Member]
Derivative [Line Items]
Effective interest rate	2.49%		2.49%