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Schedule IV - Mortgage Loans on Real Estate (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Abstract]      
Mortgage Loans on Real Estate $ 1,019,702us-gaap_MortgageLoansOnRealEstate [1],[2] $ 658,583us-gaap_MortgageLoansOnRealEstate $ 389,167us-gaap_MortgageLoansOnRealEstate
[1] Subject to prior liens.
[2] The aggregate cost for federal income tax purposes is $1,019,702.