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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Beginning Balance as of December 31, $ 117,953 $ 107,432
Redemptions 0 (16,712)
Granted 0 4,189
Changes in redemption value 1,542 22,912
Currency Translation Adjustments (318) 132
Ending Balance as of March 31, $ 119,177 $ 117,953