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Indebtedness - Summary of Indebtedness (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 1,490,931 |  |
Unsecured Credit Facility |  | 158,000 | $ 0 |
2027 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 6,070 | 6,070 |
Interest Rate |  | 7.15% |  |
Effective Interest Rate |  | 7.11% |  |
Maturity Date |  | May 15, 2027 |  |
2028 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 31,901 | 31,901 |
Interest Rate |  | 7.60% |  |
Effective Interest Rate |  | 8.13% |  |
Maturity Date |  | Jul. 15, 2028 |  |
2032 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 10,600 | 10,600 |
Interest Rate |  | 7.75% |  |
Effective Interest Rate |  | 7.87% |  |
Maturity Date |  | Apr. 15, 2032 |  |
2027 Private Placement Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 125,000 | 125,000 | $ 125,000
Interest Rate |  | 4.30% |  |
Effective Interest Rate |  | 4.30% |  | 4.30%
Maturity Date |  | Apr. 20, 2027 |  |
2028 Private Placement Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 150,000 | $ 150,000 |
Interest Rate |  | 3.86% |  |
Effective Interest Rate |  | 3.86% | 3.86% |
Maturity Date |  | Feb. 15, 2028 |  |
2029 Private Placement Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 75,000 | $ 75,000 | $ 75,000
Interest Rate |  | 4.40% |  |
Effective Interest Rate |  | 4.40% |  | 4.40%
Maturity Date |  | Apr. 20, 2029 |  |
2029 II Private Placement Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 150,000 | 0 |
Interest Rate |  | 3.97% |  |
Effective Interest Rate |  | 4.23% |  |
Maturity Date |  | Jul. 23, 2029 |  |
2030 Private Placement Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 150,000 | $ 150,000 |
Interest Rate |  | 3.96% |  |
Effective Interest Rate |  | 3.96% | 3.96% |
Maturity Date |  | Feb. 15, 2030 |  |
2014 Unsecured Term Loan (A) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 200,000 | $ 200,000 |
Interest Rate | [1] | 3.39% |  |
Maturity Date |  | Jan. 29, 2021 |  |
2015 Unsecured Term Loan (A) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 260,000 | 260,000 |
Interest Rate | [1] | 2.89% |  |
Maturity Date |  | Sep. 12, 2022 |  |
Mortgage Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 174,360 | 297,610 |
Unamortized Debt Issuance Costs |  | (675) | (1,246) |
Unamortized Premiums |  | 0 | 106 |
Long-term Debt |  | $ 173,685 | 296,470 |
Maturity Date Range, Start |  | Jul. 01, 2020 |  |
Maturity Date Range, End |  | Aug. 01, 2028 |  |
Senior Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | $ 698,571 | 548,571 |
Unamortized Debt Issuance Costs |  | (4,485) | (3,990) |
Long-term Debt |  | 694,015 | 544,504 |
Unamortized Discounts |  | (71) | (77) |
Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 460,000 | 460,000 |
Unamortized Debt Issuance Costs |  | (2,135) | (3,191) |
Long-term Debt |  | 457,865 | 456,809 |
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Costs |  | (2,300) | (3,554) |
Unsecured Credit Facility |  | $ 158,000 | $ 0 |
Interest Rate |  | 2.90% |  |
Maturity Date | [2] | Oct. 29, 2021 |  |
Minimum | Mortgage Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 4.03% |  |
Effective Interest Rate |  | 4.03% |  |
Maximum | Mortgage Loans Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 6.50% |  |
Effective Interest Rate |  | 6.50% |  |
[1] | See Note 12.
[2] | The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $2,300 and $3,554 as of December 31, 2019 and 2018, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.

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