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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation Between GAAP Net Income and Taxable Income |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per GAAP | $ 3,648 | $ 2,399 | $ 1,633 | $ (1,205) | $ 1,371 | $ 9,608 | $ 665 | $ 1,425 | $ 6,475 | $ 13,069 | $ (15,944)
Adjustments to GAAP net income (loss): |  |  |  |  |  |  |  |  |  |  |
GAAP depreciation and amortization |  |  |  |  |  |  |  |  | 90,507 | 93,675 | 100,227
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (66,376) | (62,657) | (62,653)
Tax basis more than GAAP basis on assets sold |  |  |  |  |  |  |  |  |  |  | (907)
Straight line rent adjustment, net |  |  |  |  |  |  |  |  | (10,462) | (1,350) | (2,977)
Deferred rent, net |  |  |  |  |  |  |  |  | 535 | 210 | 1,226
Non-taxable distributions |  |  |  |  |  |  |  |  |  | (710) | (1,289)
Other, net |  |  |  |  |  |  |  |  | 4,099 | (6,651) | 6,582
Taxable income |  |  |  |  |  |  |  |  | 24,778 | 35,586 | 24,265
Taxable income subject to distribution requirement |  |  |  |  |  |  |  |  | $ 24,778 | $ 35,586 | $ 24,265
Tax components of the Company's common distributions paid per share |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.25 | $ 0.35 | $ 0.24
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  | 0.11 | 0.11 | 0.52
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.36 | $ 0.46 | $ 0.76
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 69.96% | 76.39% | 31.74%
Return of capital (as a percent) |  |  |  |  |  |  |  |  | 30.04% | 23.61% | 68.26%
Total (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Common Stock Dividends Per Share Cash Paid Qualified Distribution |  |  |  |  |  |  |  |  | $ 0.009 | $ 0.009 | $ 0.009
Qualified distributiion as a percentage of total distribution |  |  |  |  |  |  |  |  | 2.52% | 2.52% | 2.52%

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