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Equity, Capital and Other Interests Preferred (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 803,600 shares issued and outstanding as of September 30, 2015 and 1,000,000 shares issued and outstanding as of December 31, 2014 | $ 40,180 |  | $ 40,180 |  | $ 50,000
Partial redemption of 8.29% Series K Cumulative Redeemable |  |  | (9,820) | $ 0 |
Premium on redemption of Preference Units | 0 | $ 0 | (2,789) | 0 |
ERPOP [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Partial redemption of 8.29% Series K Cumulative Redeemable |  |  | (9,820) | 0 |
Premium on redemption of Preference Units | 0 | $ 0 | 2,789 | $ 0 |
Preference Units | $ 40,180 |  | $ 40,180 |  | $ 50,000
Series K Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock Preference Units Issued | 803,600 |  | 803,600 |  | 1,000,000
Preferred Stock Preference Units Outstanding | 803,600 |  | 803,600 |  | 1,000,000
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 |  | $ 50.00 |  | $ 50.00
Preferred Stock Preference Units Dividend Rate Percentage |  |  | 8.29% |  | 8.29%
Preferred Stocks Preference Units Redemption Date |  |  | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit |  |  | $ 4.145 |  |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 803,600 shares issued and outstanding as of September 30, 2015 and 1,000,000 shares issued and outstanding as of December 31, 2014 | $ 40,180 |  | $ 40,180 |  | $ 50,000
Preferred Stock Preference Units Repurchased and Retired |  |  | 196,400 |  |
Partial redemption of 8.29% Series K Cumulative Redeemable |  |  | $ 9,820 |  |
Treasury Stock Retired, Cash Consideration |  |  | 12,700 |  |
Premium on redemption of Preference Units |  |  | $ 2,789 |  |
Series K Preferred Stock [Member] | ERPOP [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock Preference Units Issued | 803,600 |  | 803,600 |  | 1,000,000
Preferred Stock Preference Units Outstanding | 803,600 |  | 803,600 |  | 1,000,000
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 |  | $ 50.00 |  | $ 50.00
Preferred Stock Preference Units Dividend Rate Percentage |  |  | 8.29% |  | 8.29%
Preferred Stocks Preference Units Redemption Date |  |  | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit |  |  | $ 4.145 |  |
Preference Units | $ 40,180 |  | $ 40,180 |  | $ 50,000

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