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Federal Income Tax Reporting - Reconciliation Between GAAP Net Income and Taxable Income, Tax Components of Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation Between GAAP Net Income and Taxable Income |  |  |  |  |  |  |  |  |  |  |
Net income per GAAP | $ 37,440 | $ (1,679) | $ (2,075) | $ (1,071) | $ 3,648 | $ 2,399 | $ 1,633 | $ (1,205) | $ 32,615 | $ 6,475 | $ 13,069
Adjustments to GAAP net income (loss): |  |  |  |  |  |  |  |  |  |  |
GAAP depreciation and amortization |  |  |  |  |  |  |  |  | 88,244 | 90,507 | 93,675
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (79,542) | (66,376) | (62,657)
Tax basis more than GAAP basis on assets sold |  |  |  |  |  |  |  |  | (11,450) |  |
Straight line rent adjustment, net |  |  |  |  |  |  |  |  | (1,685) | (10,462) | (1,350)
Deferred rent, net |  |  |  |  |  |  |  |  | 1,956 | 535 | 210
Non-taxable distributions |  |  |  |  |  |  |  |  |  |  | (710)
Other, net |  |  |  |  |  |  |  |  | 390 | 4,099 | (6,651)
Taxable income |  |  |  |  |  |  |  |  | 30,528 | 24,778 | 35,586
Less: Capital gains recognized |  |  |  |  |  |  |  |  | 7,576 |  |
Taxable income subject to distribution requirement |  |  |  |  |  |  |  |  | $ 22,952 | $ 24,778 | $ 35,586
Tax components of the Company's common distributions paid per share |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.28 | $ 0.25 | $ 0.35
Capital gain (in dollars per share) |  |  |  |  |  |  |  |  | 0.06 |  |
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  | 0.02 | 0.11 | 0.11
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.36 | $ 0.36 | $ 0.46
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 77.51% | 69.96% | 76.39%
Capital gain (as a percent) |  |  |  |  |  |  |  |  | 16.72% |  |
Return of capital (as a percent) |  |  |  |  |  |  |  |  | 5.77% | 30.04% | 23.61%
Total (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Common Stock Dividends Per Share Cash Paid Qualified Distribution |  |  |  |  |  |  |  |  |  | $ 0.009 |
Qualified distribution as a percentage of total distribution |  |  |  |  |  |  |  |  |  | 2.52% |

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