Fair Value Measurements Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Cash held as collateral	$ 5,400		$ 5,400		$ 0
Foreign Currency Derivatives Contracts [Member]
Derivative [Line Items]
Notional amount	38,351		38,351		0
Fair value	39		39		0
Accrued Expenses And Other Liabilities [Member] | Foreign Currency Derivatives Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities	39		39		$ 0
Other Expense [Member] | Foreign Currency Derivatives Contracts [Member]
Derivative [Line Items]
Gain (losses) on derivative instruments	$ 150	$ 0	$ 324	$ 0