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Equity (Preferred Stock) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 16,200,000 |  | 16,200,000
Carrying value of preferred stock | $ 476,000,000 |  | $ 476,000,000
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 (as a percent) |  |  | 100.00%
Unrecaptured Section 1250 gain (s a percent) |  |  | 27.90%
Long term capital gain (as a percent) |  |  | 72.10%
Amount of preferred dividends in arrears | $ 0 |  |
Shares issued upon conversion | 3.9087 |  |
Maximum |  |  |
Preferred Stock |  |  |
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 |  |  |
Preferred Stock |  |  |
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 D |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 4,000,000 |  | 4,000,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25 |  | $ 25
Rate per Annum | 8.00% |  | 8.00%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 2.00 |  | $ 2.00
Carrying value of preferred stock | $ 89,041,000 |  | $ 89,041,000
Dividends declared and paid | $ 4,000,000 | $ 4,000,000 |
Series G |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 3,200,000 |  | 3,200,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25 |  | $ 25
Rate per Annum | 7.65% |  | 7.65%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 1.91 |  | $ 1.91
Carrying value of preferred stock | $ 72,664,000 |  | $ 72,664,000
Dividends declared and paid | $ 3,100,000 | 3,100,000 |
Series I |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 5,000,000 |  | 5,000,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 25 |  | $ 25
Rate per Annum | 7.50% |  | 7.50%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 1.88 |  | $ 1.88
Carrying value of preferred stock | $ 120,785,000 |  | $ 120,785,000
Dividends declared and paid | $ 4,700,000 | 4,700,000 |
Series J |  |  |
Preferred Stock |  |  |
Shares Issued and Outstanding (in shares) | 4,000,000 |  | 4,000,000
Par Value (in dollars per share) | $ 0.001 |  | $ 0.001
Liquidation Preference (in dollars per share) | $ 50.00 |  | $ 50
Rate per Annum | 4.50% |  | 4.50%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 2.25 |  | $ 2.25
Carrying value of preferred stock | $ 193,510,000 |  | $ 193,510,000
Dividends declared and paid | $ 4,500,000 | 4,500,000 |
Conversion price per share (in dollars per share) | $ 12.79 |  |
Series E |  |  |
Preferred Stock |  |  |
Dividends declared and paid |  | 5,500,000 |
Series F |  |  |
Preferred Stock |  |  |
Dividends declared and paid |  | $ 3,900,000 |
Series G and Series I |  |  |
Preferred Stock |  |  |
Redemption price as a percentage of liquidation preference | 100.00% |  |

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