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Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) item shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Deferred Leasing Commissions |  |  |
Amortization expense of deferred leasing commissions | $ 10,700 | $ 9,600 | $ 9,900
Estimated annual amortization of deferred leasing commissions for the succeeding five years |  |  |
2022 | 6,504 |  |
2023 | 6,081 |  |
2024 | 5,299 |  |
2025 | 4,377 |  |
2026 | 3,586 |  |
2027 and thereafter | 12,464 |  |
Summary of rental revenue |  |  |
Income from leases | 148,705 | 180,899 | 191,828
Reimbursable expenses | 54,825 | 61,310 | 64,421
Straight line rent adjustments | 4,017 | 1,685 | 8,876
Amortization of favorable and unfavorable leases | 34 | 313 | 402
Total | $ 207,581 | $ 244,207 | $ 265,527
Segment Reporting |  |  |
Number of reporting segments | item | 1 |  |
Net Income Per Share |  |  |
Potential dilutive shares outstanding | shares | 0 | 0 | 0
Denominator used for calculating basic and diluted net income per share (in shares) | shares | 106,667,000 | 107,303,000 | 107,233,000
Derivative instruments |  |  |
Fair value hedges outstanding | $ 0 |  |
Rental |  |  |
Summary of rental revenue |  |  |
Total | $ 207,581 | $ 244,207 | $ 265,527

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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306 + Details
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