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Equity (Preferred Stock) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 20, 2017
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  | 16,200,000 | 25,800,000 |
Carrying Value |  | $ 476,000,000 | $ 699,686,000 |
Number of days in year used in the computation of preferred stock dividends for any partial dividend period |  | 360 days | 360 days |
Number of months used in the computation of preferred stock dividends for any partial dividend period |  | 12 months | 12 months |
Number of days in month, dividends computation of dividends payable for any partial dividend period |  | 30 days | 30 days |
Capital gains distribution percentage |  | 100.00% | 47.30% |
Unrecaptured Section 1250 gain percentage |  | 27.90% | 76.15% |
Long term capital gain percentage |  | 72.10% | 23.85% |
Ordinary income percentage |  |  | 52.70% |
Amount of preferred dividends in arrears |  | $ 0 |  |
Shares issued upon conversion |  | 3.9087 |  |
Redemption price as a percentage of liquidation preference |  | 100.00% | 100.00% |
Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date |  | 30 days | 30 days |
Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date |  | 10 days | 10 days |
Series E and F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation preference, value |  |  |  | $ 240,000,000
Redemption premium |  | $ 16,300,000 |  |
Liquidation Preference (in dollars per share) |  |  |  | $ 25.00
Carrying Value |  |  | $ 223,700,000 |
Series D, E, F, G and I Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation Preference (in dollars per share) |  | $ 25 | $ 25.00 |
Series D |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  | 4,000,000 | 4,000,000 |
Par Value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Liquidation Preference (in dollars per share) |  | $ 25.00 | $ 25 |
Rate per Annum (as a percent) |  | 8.00% | 8.00% |
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 2.00 | $ 2.00 |
Carrying Value |  | $ 89,041,000 | $ 89,041,000 |
Dividends declared and paid |  | 8,000,000 | $ 8,000,000 |
Series E |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  |  | 5,600,000 |
Par Value (in dollars per share) |  |  | $ 0.001 |
Liquidation Preference (in dollars per share) |  |  | $ 25 |
Rate per Annum (as a percent) |  |  | 7.875% |
Equivalent to Fixed Annual Rate (in dollars per share) |  |  | $ 1.97 |
Carrying Value |  |  | $ 127,136,000 |
Dividends declared and paid | $ 1,100,000 | 8,300,000 | $ 11,000,000 |
Series F |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  |  | 4,000,000 |
Par Value (in dollars per share) |  |  | $ 0.001 |
Liquidation Preference (in dollars per share) |  |  | $ 25 |
Rate per Annum (as a percent) |  |  | 7.80% |
Equivalent to Fixed Annual Rate (in dollars per share) |  |  | $ 1.95 |
Carrying Value |  |  | $ 96,550,000 |
Dividends declared and paid | $ 800,000 | $ 5,900,000 | $ 7,800,000 |
Series G |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  | 3,200,000 | 3,200,000 |
Par Value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Liquidation Preference (in dollars per share) |  | $ 25.00 | $ 25 |
Rate per Annum (as a percent) |  | 7.65% | 7.65% |
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 1.91 | $ 1.91 |
Carrying Value |  | $ 72,664,000 | $ 72,664,000 |
Dividends declared and paid |  | $ 6,100,000 | $ 6,100,000 |
Series I |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  | 5,000,000 | 5,000,000 |
Par Value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Liquidation Preference (in dollars per share) |  | $ 25.00 | $ 25 |
Rate per Annum (as a percent) |  | 7.50% | 7.50% |
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 1.88 | $ 1.88 |
Carrying Value |  | $ 120,785,000 | $ 120,785,000 |
Dividends declared and paid |  | $ 9,400,000 | $ 9,400,000 |
Series J (convertible) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding |  | 4,000,000 | 4,000,000 |
Par Value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Liquidation Preference (in dollars per share) |  | $ 50 | $ 50.00 |
Rate per Annum (as a percent) |  | 4.50% | 4.50% |
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 2.25 | $ 2.25 |
Carrying Value |  | $ 193,510,000 | $ 193,510,000 |
Dividends declared and paid |  | $ 9,000,000 | $ 9,000,000 |
Conversion price (in dollars per share) |  | $ 12.79 | $ 12.79 |
Redemption price as a percentage of liquidation preference |  | 100.00% | 100.00% |
Class D, E, F, G, I |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation Preference (in dollars per share) |  | $ 25.00 | $ 25.00 |

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