Derivative Financial Instruments Derivative Instruments and Hedging Activities - FV of Derivative Instruments Included Within Consolidated Balance Sheet (Details) - Foreign Exchange Forward [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 941	$ 0
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	863	0
Derivative Financial Instruments, Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 1,804	$ 0