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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Beginning Balance $ 117,953 $ 107,432 $ 77,560
Redemptions (4,270) (16,712) (9,068)
Granted 0 4,189 15,318
Changes in redemption value 35,689 22,912 24,532
Currency translation adjustments (838) 132 (910)
Ending Balance $ 148,534 $ 117,953 $ 107,432