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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Beginning Balance as of January 1, $ 107,432 $ 77,560 $ 33,728
Redemptions (16,712) (9,068) (7,987)
Granted 4,189 15,318 39,142
Changes in redemption value 22,912 24,532 11,500
Currency translation adjustments 132 (910) 1,177
Ending Balance as of December 31, $ 117,953 $ 107,432 $ 77,560