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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Beginning Balance $ 117,953 $ 107,432
Redemptions (3,811) (16,712)
Granted 0 4,189
Changes in redemption value 25,009 22,912
Currency Translation Adjustments (528) 132
Ending Balance $ 138,623 $ 117,953