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Equity (Preferred Stock) (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 20, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding (in shares) |  | 16,200,000 |  | 25,800,000
Amount of preferred dividends in arrears |  | $ 0 | $ 0 |
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) |  |  |  | 47.30%
Unrecaptured Section 1250 gain (s a percent) |  |  |  | 76.15%
Long term capital gain (as a percent) |  |  |  | 23.85%
Ordinary income (as a percent) |  |  |  | 52.70%
Redemption price as a percentage of liquidation preference |  | 100.00% | 100.00% |
Shares issued upon conversion |  | 3.9087 |  | 3.9087
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 D |  |  |  |
Class of Stock [Line Items] |  |  |  |
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) |  | $ 25.00 | $ 25.00 | $ 25
Rate per Annum |  | 8.00% |  | 8.00%
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 2.00 |  | $ 2.00
Dividends declared and paid |  | $ 6,000,000 | $ 6,000,000 |
Series E |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding (in shares) |  |  |  | 5,600,000
Par Value (in dollars per share) |  |  |  | $ 0.001
Liquidation preference (in dollars per share) |  |  |  | $ 25
Rate per Annum |  |  |  | 7.875%
Equivalent to Fixed Annual Rate (in dollars per share) |  |  |  | $ 1.97
Dividends declared and paid |  | 8,300,000 | 8,300,000 |
Series F |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Issued and Outstanding (in shares) |  |  |  | 4,000,000
Par Value (in dollars per share) |  |  |  | $ 0.001
Liquidation preference (in dollars per share) |  |  |  | $ 25
Rate per Annum |  |  |  | 7.80%
Equivalent to Fixed Annual Rate (in dollars per share) |  |  |  | $ 1.95
Dividends declared and paid |  | $ 5,900,000 | 5,900,000 |
Series G |  |  |  |
Class of Stock [Line Items] |  |  |  |
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
Dividends declared and paid |  | $ 4,600,000 | 4,600,000 |
Series I |  |  |  |
Class of Stock [Line Items] |  |  |  |
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
Dividends declared and paid |  | $ 7,000,000 | 7,000,000 |
Series J |  |  |  |
Class of Stock [Line Items] |  |  |  |
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 |  | $ 50.00
Rate per Annum |  | 4.50% |  | 4.50%
Equivalent to Fixed Annual Rate (in dollars per share) |  | $ 2.25 |  | $ 2.25
Dividends declared and paid |  | $ 6,800,000 | $ 6,800,000 |
Redemption price as a percentage of liquidation preference |  |  |  | 100.00%
Conversion price per share (in dollars per share) |  | $ 12.79 |  | $ 12.79
Series E and F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Carrying value of preferred stock |  | $ 223,700,000 |  |
Preferred stock redemption premium |  | $ 16,300,000 |  |
Series D, E, F, G and I Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation preference (in dollars per share) |  | $ 25 |  | $ 25.00
Subsequent Event | Series E |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends in arrears (in dollars per share) | $ 0.191406 |  |  |
Subsequent Event | Series F |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation preference (in dollars per share) | 25 |  |  |
Preferred stock dividends in arrears (in dollars per share) | 0.189583 |  |  |
Subsequent Event | Series E and F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Liquidation preference (in dollars per share) | $ 25.00 |  |  |
Aggregate liquidation preference | $ 240,000,000 |  |  |
Amount of preferred dividends in arrears | $ 1,800,000 |  |  |

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