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Earnings Per Common Share - Narrative (Details) - shares | 1 Months Ended | 3 Months Ended
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Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) | 15,250,000 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements |  | 1,093,000 | 0
Down REIT |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares) |  | 6,000,000 | 7,000,000
Employee stock option |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares) |  | 1,000,000 | 1,000,000
Convertible Units [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Shares of anti-dilutive securities excluded from earnings per share calculation (in shares) |  | 18,000,000 |
At-The-Market Program 2019 |  |  |
Earnings Per Share [Abstract] |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  | 3,600,000 |
Option indexed to issuers equity, term |  | 1 year |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
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- Definition Additional shared included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward arrangements using the reverse treasury stock method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2366-109256 + Details
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