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Subsequent Events (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 02, 2015
Mar. 07, 2014
Subsequent Event [Line Items]    
Damages Awarded to Plaintiff   $ 1,424buks_DamagesAwardedToPlaintiff
Damages Received from Defendant $ 1,324buks_DamagesReceivedFromDefendant