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Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Unrealized losses on derivative instruments $ (8,618)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent $ (6,843)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
Interest Rate Cap [Member]    
Unrealized losses on derivative instruments (1,187)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateCapMember		 0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateCapMember
Interest Rate Swap [Member]    
Unrealized losses on derivative instruments $ (7,431)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_InvestmentTypeAxis
= us-gaap_InterestRateSwapMember		 $ (6,843)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
/ us-gaap_InvestmentTypeAxis
= us-gaap_InterestRateSwapMember