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Schedule II: Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II: Valuation and Qualifying Accounts | Valuation and Qualifying Accounts
Allowance Accounts(1) |  |  |  | Additions |  | Deductions |  |
Year Ended December 31, |  | Balance at Beginning of Year |  | Amounts Charged Against Operations, net |  | Acquired Properties |  | Uncollectible Accounts Written-off |  | Disposed Properties |  | Balance at End of Year
2017 |  | $ | 29,518 |  |  | $ | 144,135 |  |  | $ | — |  |  | $ | (2,732 | ) |  | $ | (1,547 | ) |  | $ | 169,374 |
2016 |  | 36,180 |  |  | 1,177 |  |  | — |  |  | (2,843 | ) |  | (4,996 | ) |  | 29,518 |
2015 |  | 50,531 |  |  | 3,174 |  |  | — |  |  | (17,209 | ) |  | (316 | ) |  | 36,180 |
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(1) | Includes allowance for doubtful accounts, straight-line rent reserves, and allowances for loan and direct financing lease losses and excludes discontinued operations of $818 million for the year ended December 31, 2015.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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