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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation Between GAAP Net Income and Taxable Income |  |  |  |  |  |  |  |  |  |  |
Net income per books | $ 1,371 | $ 9,608 | $ 665 | $ 1,425 | $ (4,932) | $ 1,903 | $ (17,395) | $ 4,480 | $ 13,069 | $ (15,944) | $ 8,378
Adjustment to book income: |  |  |  |  |  |  |  |  |  |  |
Book depreciation and amortization |  |  |  |  |  |  |  |  | 93,675 | 100,227 | 92,557
Tax depreciation and amortization |  |  |  |  |  |  |  |  | (62,657) | (62,653) | (59,171)
Tax basis more than book basis on assets sold |  |  |  |  |  |  |  |  |  | (907) | (576)
Straight line rent adjustment, net |  |  |  |  |  |  |  |  | (1,350) | (2,977) | (2,976)
Deferred rent, net |  |  |  |  |  |  |  |  | 210 | 1,226 | 2
Non-taxable distributions |  |  |  |  |  |  |  |  | (710) | (1,289) | (970)
Other, net |  |  |  |  |  |  |  |  | (6,651) | 6,582 | (1,648)
Taxable income |  |  |  |  |  |  |  |  | 35,586 | 24,265 | 35,596
Taxable income subject to distribution requirement |  |  |  |  |  |  |  |  | $ 35,586 | $ 24,265 | $ 35,596
Tax components of the Company's common distributions paid per share |  |  |  |  |  |  |  |  |  |  |
Ordinary income (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.35 | $ 0.24 | $ 0.39
Return of capital (in dollars per share) |  |  |  |  |  |  |  |  | 0.11 | 0.52 | 0.37
Total (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.46 | $ 0.76 | $ 0.76
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 76.39% | 31.74% | 50.82%
Return of capital (as a percent) |  |  |  |  |  |  |  |  | 23.61% | 68.26% | 49.18%
Total (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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