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Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2018 and December 31, 2017 | $ 37,280 | $ 37,280
ERPOP [Member] |  |
Class Of Stock [Line Items] |  |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2018 and December 31, 2017 | $ 37,280 | 37,280
Preferred Stock |  |
Class Of Stock [Line Items] |  |
Preferred Stocks Preference Units Call Date | Dec. 10, 2026 |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2018 and December 31, 2017 | $ 37,280 | 37,280
Preferred Stock | ERPOP [Member] |  |
Class Of Stock [Line Items] |  |
Preferred Stocks Preference Units Call Date | Dec. 10, 2026 |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 |
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2018 and December 31, 2017 | $ 37,280 | $ 37,280

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- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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