Fair Values of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Foreign exchange forward - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	$ 2,129	$ (2,006)
Quoted Prices in Active Markets for Identical Assets / (Liabilities) - Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Significant Other Observable Inputs - Level II
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	2,129	(2,006)
Significant Other Unobservable Inputs - Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	$ 0	$ 0