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Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 22, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 03, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Dividends, Common Stock | $ 33,800,000 |  |  |  |  |
Dividends payable, date to be paid | Jul. 19, 2019 |  |  |  |  |
Dividends payable, date of record | Jul. 05, 2019 |  |  |  |  |
Repurchased and Retired, Shares |  | 0 |  | 1,337,169 |  |
Share Price |  |  |  | $ 12.92 |  |
Repurchased and Retired, Value |  | $ 0 | $ 17,281,000 | $ 17,300,000 |  |
Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Authorized Amount |  |  |  |  |  | $ 150,000,000.0
Dividend Declared [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.19 |  |  |  |  |
Redeemable Common Limited Partnership Units [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Redeemable Common Limited Partnership Units Excluded from Computation of Earnings Per Share |  |  |  | 981,626 | 1,479,799 |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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