Financial Instruments Financial Instruments - 2 (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Assets [Abstract]
Foreign currency cash flow hedges	$ 0	$ 0
Liabilities [Abstract]
Foreign currency cash flow hedges	0	0
Net investment hedge derivative - cross currency swap	0	0
Fair Value, Inputs, Level 2 [Member]
Assets [Abstract]
Foreign currency cash flow hedges	203	394
Liabilities [Abstract]
Foreign currency cash flow hedges	485	1,284
Net investment hedge derivative - cross currency swap	20,599	21,656
Fair Value, Inputs, Level 3 [Member]
Assets [Abstract]
Foreign currency cash flow hedges	0	0
Liabilities [Abstract]
Foreign currency cash flow hedges	0	0
Net investment hedge derivative - cross currency swap	$ 0	$ 0