Financial Instruments - Balance Sheet Location (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Foreign currency cash flow hedges - asset	$ 0	$ 0
Liabilities [Abstract]
Foreign currency cash flow hedges - liability	0	0
Net investment hedge derivative	0	0
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Foreign currency cash flow hedges - asset	1,295	973
Liabilities [Abstract]
Foreign currency cash flow hedges - liability	0	810
Net investment hedge derivative	19,616	15,567
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Foreign currency cash flow hedges - asset	0	0
Liabilities [Abstract]
Foreign currency cash flow hedges - liability	0	0
Net investment hedge derivative	$ 0	$ 0