| Schedule of Long-Term Debt Instruments [Table Text Block] |
| Consolidated Debt: | | Outstanding Principal | | | Unamortized Debt Issuance Costs | | | Unamortized Loan (Discount)/Premiums | | | Carrying Amount | | Type | | Weighted Average Contractual Rate (2) | | | Weighted Average Effective Rate (3) | | | Weighted Average Maturity (in years) | | | Unsecured revolver (1) | | $ | 198,892 | | | $ | (4,535 | ) | | $ | — | | | $ | 194,357 | | Floating | | | 4.5 | % | | | 4.8 | % | | | 3.0 | | | Unsecured term loans | | | 600,000 | | | | (1,142 | ) | | | — | | | | 598,858 | | Floating | | | 4.6 | % | | | 4.0 | % | | | 1.5 | | | Secured credit facilities | | | 582,535 | | | | (1,525 | ) | | | 12,157 | | | | 593,167 | | Fixed | | | 4.2 | % | | | 4.4 | % | | | 2.9 | | | Mortgages | | | 739,596 | | | | (2,741 | ) | | | 9,693 | | | | 746,548 | | Fixed | | | 3.9 | % | | | 4.0 | % | | | 3.3 | | | Unsecured notes | | | 150,000 | | | | (1,455 | ) | | | — | | | | 148,545 | | Fixed | | | 5.4 | % | | | 5.6 | % | | | 7.3 | | | Total Consolidated Debt | | $ | 2,271,023 | | | $ | (11,398 | ) | | $ | 21,850 | | | $ | 2,281,475 | | | | | 4.3 | % | | | 4.3 | % | | | 3.0 | |
| | | | | | | Unamortized | | | Unamortized | | | | | | | | Weighted | | | Weighted | | | Weighted | | | | | | | | | Debt | | | Loan | | | | | | | | Average | | | Average | | | Average | | | | | Outstanding | | | Issuance | | | (Discount) | | | Carrying | | | | Contractual | | | Effective | | | Maturity | | | Debt: | | Principal | | | Costs | | | /Premiums | | | Amount | | Type | | Rate (3) | | | Rate (4) | | | (in years) | | | Unsecured revolver (1) | | $ | 194,478 | | | $ | (526 | ) | | | — | | | $ | 193,952 | | Floating | | | 5.5 | % | | | 4.8 | % | | | 4.0 | | | Unsecured term loans | | | 600,000 | | | | (1,831 | ) | | | — | | | | 598,169 | | Floating | | | 5.6 | % | | | 4.0 | % | | | 2.5 | | | Secured credit facilities | | | 585,635 | | | | (1,901 | ) | | | 17,034 | | | | 600,768 | | Fixed | | | 4.2 | % | | | 4.4 | % | | | 3.9 | | | Mortgages (2) | | | 780,794 | | | | (3,175 | ) | | | 14,687 | | | | 792,306 | | Fixed | | | 3.8 | % | | | 4.0 | % | | | 3.7 | | | Unsecured notes | | | 150,000 | | | | (1,512 | ) | | | — | | | | 148,488 | | Fixed | | | 5.4 | % | | | 5.6 | % | | | 8.3 | | | Total Debt | | $ | 2,310,907 | | | $ | (8,945 | ) | | $ | 31,721 | | | $ | 2,333,683 | | | | | 4.6 | % | | | 4.3 | % | | | 3.8 | |
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| Schedule of Maturities of Long-Term Debt [Table Text Block] |
| | | Original maturities on or before December 31, | | | Debt: | | 2026 | | | 2027 | | | 2028 | | | 2029 | | | 2030 | | | Thereafter | | | Unsecured revolver (1) | | $ | — | | | $ | — | | | $ | — | | | $ | 198,892 | | | $ | — | | | $ | — | | | Unsecured term loans | | | 200,000 | | | | — | | | | 400,000 | | | | — | | | | — | | | | — | | | Secured credit facilities | | | 9,111 | | | | 10,081 | | | | 453,936 | | | | 2,670 | | | | 106,737 | | | | — | | | Mortgages | | | 126,763 | | | | 11,281 | | | | 126,019 | | | | 416,031 | | | | — | | | | 59,502 | | | Unsecured notes | | | — | | | | — | | | | — | | | | — | | | | — | | | | 150,000 | | | Total | | $ | 335,874 | | | $ | 21,362 | | | $ | 979,955 | | | $ | 617,593 | | | $ | 106,737 | | | $ | 209,502 | |
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