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Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Equity (Details)        
Net change in derivative fair value, taxes   $ 4,165   $ 1,578
Foreign currency translation adjustment, taxes $ 1,185 $ (582) $ 851 $ (770)