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Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 14 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Sep. 30, 2016 | Jul. 22, 2015 | Nov. 05, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends, Common Stock | $ 28,300,000 |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  | 6.90% |  |  |
Dividends, Preferred Stock |  | $ 1,725,000 | $ 1,725,000 | $ 5,175,000 | $ 5,175,000 |  |  |  |
Shares Authorized For Equity Offering Program |  |  |  |  |  |  |  |  | 16,000,000
Authorized Amount |  |  |  |  |  |  |  | $ 100,000,000 |
Number of shares available for repurchase under the preexisting share repurchase program |  |  |  |  |  |  |  | 539,200 |
Repurchased and Retired, Shares |  |  |  | 0 | 4,701,302 |  | 5,209,437 |  |
Share Price |  |  |  | $ 12.90 | $ 12.92 |  |  |  |
Repurchased and Retired, Value |  |  |  | $ 67,300,000 | $ 60,817,000 |  |  |  |
Common shares price per share |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |  | $ 25.00 |  |  | $ 25.00 |  |
Dividends, Preferred Stock | $ 1,700,000 |  |  |  |  |  |  |  |
Dividend Declared [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ 0.16 |  |  |  |  |  |  |  |
Redeemable Common Limited Partnership Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  | 1,479,799 | 1,535,102 |  |  |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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