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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Significant Accounting Policies [Line Items]    
Beginning Balance $ 148,534 $ 117,953
Redemptions (1,605) (4,270)
Granted 0 0
Changes in redemption value 9,336 35,689
Currency Translation Adjustments (285) (838)
Ending Balance $ 155,980 $ 148,534