Derivative Financial Instruments Derivative Financial Instruments (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net gain (loss)	$ (8,300,000)	$ (4,600,000)	$ 5,100,000
Remaining maturities of foreign currency forward contracts	6 months
Term loan, effective interest rate	2.49%
Interest Rate Derivative Asset, at Fair Value, Net	1,300,000
Interest Rate Derivative Assets, at Fair Value	2,100,000
Interest Rate Derivative Liabilities, at Fair Value	800,000
Fair value adjustment on interest rate swap contracts	$ (735,000)	$ 1,660,000	$ 0