Fair Value Measurements Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Cash held as collateral	$ 5,464		$ 5,464		$ 0
Foreign Currency Derivatives Contracts [Member]
Derivative [Line Items]
Notional amount	35,372		35,372		0
Fair value	1,400		1,400		0
Accrued Expenses And Other Liabilities [Member] | Foreign Currency Derivatives Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities	1,400		1,400		$ 0
Other Expense [Member] | Foreign Currency Derivatives Contracts [Member]
Derivative [Line Items]
Gain (losses) on derivative instruments	$ 237	$ 0	$ 174	$ 0