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Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended
--- | --- | ---
Sep. 11, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |  |
Dividends, Common Stock |  | $ 32.5 |
Dividends payable, date to be paid | Oct. 18, 2018 |  |
Dividends payable, date of record | Oct. 04, 2018 |  |
Preferred shares authorized |  | 20,000,000 | 20,000,000
Preferred shares outstanding |  | 0 | 0
Dividend Declared [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividends Payable, Amount Per Share | $ 0.18 |  |
Redeemable Common Limited Partnership Units [Member] |  |  |
Class of Stock [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  | 1,479,799 | 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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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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