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Secured and Unsecured Debt (Details 2) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Secured Debt, Encumbers Real Estate Owned, Amount | $ 2,200,000 |
Secured Debt, Encumbers Real Estate Owned, Percent | 26.60% |
Debt Instrument Weighted Average Years to Maturity | 4 years 29 days |
Unamortized discount | $ 5,700 | $ 6,700
Aggregate maturities of secured debt |  |
2014 | 191,442 |
2015 | 242,692 |
2016 | 731,219 |
2017 | 858,099 |
2018 | 313,571 |
Thereafter | 1,227,380 |
Total | 1,350,439 | 1,361,529
Secured Debt, Unencumbered Real Estate Owned, Amount | $ 6,200,000 |
Secured Debt, Unencumbered Real Estate Owned, Percent | 73.40% |
Fixed Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 2 years 6 months 10 days |
Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 5 years 3 months |
ThreePointSevenTermNotesDueOctober2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 5 years 3 months |
2.68% Term Notes due December 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 2 years 11 months 4 days |
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 6 years 6 months 10 days |
Unamortized discount | $ 2,344 | 2,523
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 1 year 20 days |
Mortgages Notes Payable [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 1 year 6 months 25 days |
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 7 years 8 months 8 days |
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 3 years 6 months 14 days |
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 4 years 9 months 10 days |
3.75 MTN Due July 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity | 9 years |
Unamortized discount | $ 938 | 990
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Weighted Average Years to Maturity |  |
Unamortized discount | $ 0 | $ 6

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