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Debt Obligations (Details) (Secured Debt [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Secured Debt [Member]
  
Debt Instrument [Line Items]  
Mortgage debt principal payment $ 3.6us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember