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Mortgages and Notes Payable (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) extensions | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Oct. 17, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable, net | $ 1,901,066 |  |  | $ 1,901,066 |  |  | $ 2,491,813
Unamortized debt issuance costs | (6,889) |  |  | (6,889) |  |  | (7,801)
Repayment of bridge credit facility |  |  |  | 528,800 | $ 337,900 |  |
Revolving Credit Facility due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity on revolving credit facility | $ 475,000 |  |  | 475,000 |  |  |
Maturity date on revolving credit facility | Jan. 01, 2018 |  |  |  |  |  |
Additional borrowing capacity on revolving credit facility | $ 75,000 |  |  | 75,000 |  |  |
Number of additional maturity extensions | extensions | 2 |  |  |  |  |  |
Term of optional extension | 6 months |  |  |  |  |  |
Interest rate spread (in hundredths) | 1.10% |  |  |  |  |  |
Annual facility fee (in hundredths) | 0.20% |  |  |  |  |  |
Amount outstanding on revolving credit facility | $ 28,000 |  |  | 28,000 |  |  |
Outstanding letters of credit on revolving credit facility | 200 |  |  | 200 |  |  |
Unused borrowing capacity on revolving credit facility | 446,800 |  |  | 446,800 |  |  |
7.50% Mortgage Loan due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal debt amount |  | $ 43,600 |  |  |  |  |
Effective interest rate (in hundredths) |  | 7.50% |  |  |  |  |
Scheduled maturity date |  | Aug. 06, 2016 |  |  |  |  |
Variable Rate Term Loan Facility due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | $ 150,000 |  |  |  |  |
Maturity date on revolving credit facility |  | Jan. 28, 2022 |  |  |  |  |
Interest rate spread (in hundredths) |  | 1.10% |  |  |  |  |
Amount outstanding on revolving credit facility | 75,000 |  |  | 75,000 |  |  |
Term of debt (in months) |  | 67 months |  |  |  |  |
Bridge Term Loan Facility due 2016 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maturity date on revolving credit facility |  |  | Mar. 28, 2016 |  |  |  |
Repayment of bridge credit facility |  |  | $ 350,000 |  |  |  |
Secured indebtedness [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable, net | 129,013 |  |  | 129,013 |  |  | 175,281
Aggregate undepreciated book value of secured real estate assets | 247,100 |  |  | 247,100 |  |  |
Unsecured indebtedness [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgages and notes payable, net | $ 1,778,942 |  |  | $ 1,778,942 |  |  | $ 2,324,333
Subsequent Event [Member] | Revolving Credit Facility due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  |  | $ 38,000 |
Outstanding letters of credit on revolving credit facility |  |  |  |  |  | 200 |
Unused borrowing capacity on revolving credit facility |  |  |  |  |  | 436,800 |
Subsequent Event [Member] | Variable Rate Term Loan Facility due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  |  | $ 75,000 |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility interest rate basis | LIBOR plus 110 basis points |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Term Loan Facility due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Facility interest rate basis |  | LIBOR plus 110 basis points |  |  |  |  |

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- Definition Amount after accumulated amortization of debt issuance costs. Includes, but not limited to, legal, accounting, underwriting, printing, and registration costs. + References No definition available. + Details
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- Definition The term of the debt instrument, in years. + References No definition available. + Details
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