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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation Between GAAP Net Income and Taxable Income |  |  |  |  |  |  |  |  |  |  |
Net income per books | $ (4,932) | $ 1,903 | $ (17,395) | $ 4,480 | $ 1,729 | $ 2,458 | $ 1,612 | $ 2,579 | $ (15,944) | $ 8,378 | $ 35,014
Adjustment to book income: |  |  |  |  |  |  |  |  |  |  |
Book depreciation and amortization |  |  |  |  |  |  |  |  | 100,227 | 92,557 | 91,201
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (62,653) | (59,171) | (53,089)
Tax basis more than book basis on assets sold |  |  |  |  |  |  |  |  | (907) | (576) | (2,739)
Straight line rent adjustment, net |  |  |  |  |  |  |  |  | (2,977) | (2,976) | (3,493)
Deferred rent, net |  |  |  |  |  |  |  |  | 1,226 | 2 | 618
Non-taxable distributions |  |  |  |  |  |  |  |  | (1,289) | (970) |
Other, net |  |  |  |  |  |  |  |  | 6,582 | (1,648) | 995
Taxable income |  |  |  |  |  |  |  |  | 24,265 | 35,596 | 68,507
Less: Capital gains recognized |  |  |  |  |  |  |  |  |  |  | 10,360
Taxable income subject to distribution requirement |  |  |  |  |  |  |  |  | $ 24,265 | $ 35,596 | $ 58,147
Tax components of the Company's common distributions paid per share |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.24 | $ 0.39 | $ 0.60
Capital gain (in dollars per share) |  |  |  |  |  |  |  |  |  |  | 0.09
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  | 0.52 | 0.37 | 0.07
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.76 | $ 0.76 | $ 0.76
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 31.74% | 50.82% | 79.17%
Capital gain (as a percent) |  |  |  |  |  |  |  |  |  |  | 11.60%
Return of capital (as a percent) |  |  |  |  |  |  |  |  | 68.26% | 49.18% | 9.23%
Total (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Capital gains as percentage of total distributions |  |  |  |  |  |  |  |  |  |  | 11.60%
Percentage of total distributions taxed as an Unrecaptured Section 1250 gain |  |  |  |  |  |  |  |  |  |  | 5.96%

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