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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation Between GAAP Net Income and Taxable Income |  |  |  |  |  |  |  |  |  |  |
Net income per books | $ 1,729 | $ 2,458 | $ 1,612 | $ 2,579 | $ 15,412 | $ 3,166 | $ 3,903 | $ 12,533 | $ 8,378 | $ 35,014 | $ 13,148
Adjustment to book income: |  |  |  |  |  |  |  |  |  |  |
Book depreciation and amortization |  |  |  |  |  |  |  |  | 92,557 | 91,201 | 96,550
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (59,171) | (53,089) | (53,148)
Tax basis more than book basis on assets sold |  |  |  |  |  |  |  |  | (576) | (2,739) | 1,567
Straight line rent adjustment, net |  |  |  |  |  |  |  |  | (2,976) | (3,493) | (5,856)
Deferred rent, net |  |  |  |  |  |  |  |  | 2 | 618 | 112
Non-taxable distributions |  |  |  |  |  |  |  |  | (970) |  | (107)
Other, net |  |  |  |  |  |  |  |  | (1,648) | 995 | 189
Taxable income |  |  |  |  |  |  |  |  | 35,596 | 68,507 | 52,455
Less: Capital gains recognized |  |  |  |  |  |  |  |  |  | 10,360 |
Taxable income subject to distribution requirement |  |  |  |  |  |  |  |  | $ 35,596 | $ 58,147 | $ 52,455
Tax components of the Company's common distributions paid per share |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.39 | $ 0.60 | $ 0.55
Capital gain (in dollars per share) |  |  |  |  |  |  |  |  |  | 0.09 |
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  | 0.37 | 0.07 | 0.21
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.76 | $ 0.76 | $ 0.76
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 50.82% | 79.17% | 72.52%
Capital gain (as a percent) |  |  |  |  |  |  |  |  |  | 11.60% |
Return of capital (as a percent) |  |  |  |  |  |  |  |  | 49.18% | 9.23% | 27.48%
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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