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Commitments and Contingencies (Details) (Purchase Commitment [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Purchase Commitment [Member]
 
Purchase Commitment, Excluding Long-term Commitment [Line Items]  
Remaining minimum amount committed $ 41.1us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_PurchaseCommitmentMember