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Mortgages and Notes Payable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) extension | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 25, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | $ 2,085,831,000 | $ 2,014,333,000 |  |  |
Less-unamortized debt issuance costs | (9,164,000) | (8,161,000) |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
2019 | 367,000 |  |  |  |
2020 | 225,444,000 |  |  |  |
2021 | 300,757,000 |  |  |  |
2022 | 583,038,000 |  |  |  |
2023 | 251,376,000 |  |  |  |
Thereafter | 734,013,000 |  |  |  |
Less-unamortized debt issuance costs | (9,164,000) | (8,161,000) |  |  |
Mortgages and notes payable, net | 2,085,831,000 | 2,014,333,000 |  |  |
Annual repayments through principal amortization | 1,800,000 |  |  |  |
Gains/(losses) on debt extinguishment | $ 0 | (26,000) | $ 0 |  |
Lender covenant compliance to accelerate outstanding borrowings | 51.00% |  |  |  |
Cross-default minimum threshold | $ 30,000,000 |  |  |  |
Holders covenant compliance of bonds | 25.00% |  |  |  |
Uncured covenant compliance default period | 60 days |  |  |  |
Capitalized Interest [Abstract] |  |  |  |  |
Capitalized Interest | $ 6,700,000 | 8,800,000 | 8,200,000 |  |
4.0% Mortgage Loan Due 2029 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  | $ 100,000,000 |  |  |
Scheduled maturity date |  | May 01, 2029 |  |  |
Current interest rate (in hundredths) |  | 4.00% |  |  |
Debt issuance costs |  | $ 800,000 |  |  |
5.85% (5.88% effective rate) Notes due 2017 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  | $ 379,700,000.0 |  |  |
Current interest rate (in hundredths) |  | 5.85% |  |  |
7.50% Notes due 2018 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt | $ 200,000,000 |  |  |  |
Current interest rate (in hundredths) | 7.50% |  |  |  |
3.875% (4.038% effective rate) Notes due 2027 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  | $ 300,000,000 |  |  |
Scheduled maturity date |  | Mar. 01, 2027 |  |  |
Current interest rate (in hundredths) |  | 4.038% |  |  |
Original issuance discount |  | $ 4,000,000 |  |  |
Stated interest rate (in hundredths) |  | 3.875% |  |  |
Debt issuance costs |  | $ 2,500,000 |  |  |
4.125% (4.271% effective rate) Notes due 2028 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt | $ 350,000,000 |  |  |  |
Scheduled maturity date | Mar. 15, 2028 |  |  |  |
Current interest rate (in hundredths) | 4.271% |  |  |  |
Original issuance discount | $ 4,100,000 |  |  |  |
Stated interest rate (in hundredths) | 4.125% |  |  |  |
Debt issuance costs | $ 2,900,000 |  |  |  |
Variable Rate Term Loan due 2020 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Early repayment of debt |  | 125,000,000 |  |  |
Principal amount of debt |  |  |  | $ 350,000,000 |
Scheduled maturity date |  |  |  | Jun. 01, 2020 |
Interest rate, basis spread |  |  |  | 1.10% |
Debt issuance costs |  |  |  | $ 1,300,000 |
Gains/(losses) on debt extinguishment |  | (400,000) |  |  |
Variable Rate Term Loan due 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Interest rate basis |  |  |  | LIBOR plus 110 basis points |
Variable Rate Term Loan due 2022 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  | 200,000,000 | $ 150,000,000 |  |
Scheduled maturity date |  |  | Jan. 01, 2022 |  |
Interest rate, basis spread |  |  | 1.10% |  |
Debt issuance costs |  | 300,000 |  |  |
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Interest rate basis |  |  | LIBOR plus 110 basis points |  |
Variable Rate Term Loan (2) due 2022 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  | $ 200,000,000 |  |  |
Term of debt instrument (in years) |  | 5 years |  |  |
Scheduled maturity date |  | Nov. 01, 2022 |  |  |
Interest rate basis |  | LIBOR plus 110 basis points |  |  |
Interest rate, basis spread |  | 1.10% |  |  |
Debt issuance costs |  | $ 1,100,000 |  |  |
Gains/(losses) on debt extinguishment |  | $ (400,000) |  |  |
Variable Rate Term Loan (1) due 2019 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Scheduled maturity date |  | Jan. 01, 2019 |  |  |
Interest rate basis |  | LIBOR plus 120 basis points |  |  |
Interest rate, basis spread |  | 1.20% |  |  |
Revolving Credit Facility due 2022 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Maximum borrowing capacity on revolving credit facility |  | $ 600,000,000 | $ 475,000,000 |  |
Maturity date on revolving credit facility |  | Jan. 01, 2022 |  |  |
Additional borrowing capacity on revolving credit facility |  | $ 400,000,000 |  |  |
Number of additional maturity extensions | extension |  | 2 |  |  |
Term of optional extensions |  | 6 months |  |  |
Annual facility fee (in hundredths) |  | 0.20% |  |  |
Amount outstanding on revolving credit facility | 182,000,000 |  |  |  |
Outstanding letters of credit on revolving credit facility | 200,000 |  |  |  |
Unused borrowing capacity on revolving credit facility | 417,800,000 |  |  |  |
Interest rate, basis spread |  | 1.00% |  |  |
Debt issuance costs |  | $ 3,500,000 |  |  |
Gains/(losses) on debt extinguishment |  | $ (100,000) |  |  |
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Interest rate |  | LIBOR plus 100 basis points |  |  |
Variable Rate Term Loan (2) due 2019 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Principal amount of debt |  |  |  | $ 225,000,000 |
Term of debt instrument (in years) |  |  |  | 7 years |
Scheduled maturity date |  |  |  | Jan. 01, 2019 |
Interest rate, basis spread |  |  |  | 1.75% |
Variable Rate Term Loan (2) due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Interest rate basis |  |  |  | LIBOR plus 175 basis points |
5.10%(4.22% effective rate) Mortgage Loan due 2017 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Early repayment of debt |  | $ 108,200,000 |  |  |
Current interest rate (in hundredths) |  | 4.22% |  |  |
Gains/(losses) on debt extinguishment |  | $ 400,000 |  |  |
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Early repayment of debt |  | 18,000,000 |  |  |
Principal amount of debt |  |  |  | $ 18,000,000 |
Scheduled maturity date |  |  |  | Jul. 06, 2017 |
Current interest rate (in hundredths) |  |  |  | 5.36% |
Percentage of partner's interest in asset acquired (in hundredths) |  |  |  | 77.20% |
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Early repayment of debt |  | 500,000 |  |  |
Principal amount of debt |  |  |  | $ 10,200,000.0 |
Scheduled maturity date |  |  |  | Jul. 06, 2017 |
Current interest rate (in hundredths) |  |  |  | 8.60% |
Gains/(losses) on debt extinguishment |  | 400,000 |  |  |
7.50% Mortgage Loan due 2016 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Early repayment of debt |  |  | $ 43,600,000 |  |
Scheduled maturity date |  |  | Aug. 01, 2016 |  |
Current interest rate (in hundredths) |  |  | 7.50% |  |
Bridge Credit Facility due 2016 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Maximum borrowing capacity on revolving credit facility |  |  |  | $ 350,000,000 |
Amount outstanding on revolving credit facility |  |  |  |  |
Term of debt instrument (in years) |  |  |  | 6 months |
Interest rate, basis spread |  |  |  | 1.10% |
Bridge Credit Facility due 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Interest rate |  |  |  | LIBOR plus 110 basis points |
Secured indebtedness [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 97,179,000 | 98,981,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 97,179,000 | 98,981,000 |  |  |
Aggregate undepreciated book value of secured real estate assets | 147,600,000 |  |  |  |
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 97,179,000 | 98,981,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 97,179,000 | 98,981,000 |  |  |
Unsecured indebtedness [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 1,997,816,000 | 1,923,513,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 1,997,816,000 | 1,923,513,000 |  |  |
Unsecured indebtedness [Member] | 7.50% Notes due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 0 | 200,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 0 | 200,000,000 |  |  |
Unsecured indebtedness [Member] | 3.20% (3.363% effective rate) Notes due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 298,936,000 | 298,504,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 298,936,000 | 298,504,000 |  |  |
Unamortized discount | 1,100,000 | 1,500,000 |  |  |
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 248,938,000 | 248,675,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 248,938,000 | 248,675,000 |  |  |
Unamortized discount | 1,100,000 | 1,300,000 |  |  |
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 296,734,000 | 296,334,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 296,734,000 | 296,334,000 |  |  |
Unamortized discount | 3,300,000 | 3,700,000 |  |  |
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 346,208,000 | 0 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 346,208,000 | 0 |  |  |
Unamortized discount | 3,800,000 |  |  |  |
Unsecured indebtedness [Member] | Variable Rate Term Loan (4) due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 0 | 10,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | 0 | 10,000,000 |  |  |
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | 225,000,000 | 225,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | $ 225,000,000 | 225,000,000 |  |  |
Interest rate under derivative instruments (in hundredths) | 2.78% |  |  |  |
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | $ 200,000,000 | 200,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | $ 200,000,000 | 200,000,000 |  |  |
Interest rate under derivative instruments (in hundredths) | 2.79% |  |  |  |
Current interest rate (in hundredths) | 3.45% |  |  |  |
Unsecured indebtedness [Member] | Variable Rate Term Loan (2) due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | $ 200,000,000 |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | $ 200,000,000 |  |  |  |
Current interest rate (in hundredths) | 3.61% |  |  |  |
Unsecured indebtedness [Member] | Variable Rate Term Loan (1) due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net |  | 200,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net |  | 200,000,000 |  |  |
Unsecured indebtedness [Member] | Revolving Credit Facility due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgages and notes payable, net | $ 182,000,000 | 245,000,000 |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Mortgages and notes payable, net | $ 182,000,000 | $ 245,000,000 |  |  |
Current interest rate (in hundredths) | 3.46% |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member] |  |  |  |  |
Scheduled future principal payments [Abstract] |  |  |  |  |
Amount outstanding on revolving credit facility |  |  |  |  | $ 191,000,000
Outstanding letters of credit on revolving credit facility |  |  |  |  | 200,000
Unused borrowing capacity on revolving credit facility |  |  |  |  | $ 408,800,000

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