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Vendor Settlement Credit (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Vendor Settlement Credit [Abstract]      
Vendor settlement credit $ 6,836us-gaap_GainLossRelatedToLitigationSettlement $ 0us-gaap_GainLossRelatedToLitigationSettlement $ 0us-gaap_GainLossRelatedToLitigationSettlement