Derivative Financial Instruments Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Net gain (loss)	$ (6,700)	$ (8,300)	$ 4,600
Remaining maturities of foreign currency forward contracts	6 months
Term loan, effective interest rate	2.49%
Fair value adjustment on interest rate swap contracts	$ (602)	$ (735)	$ 1,660
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	300
Other Assets [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	500
Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Liability	$ 200