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Equity (Preferred Stock) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |
Shares Issued and Outstanding | 25,800,000 | 25,800,000
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
Amount of preferred dividends in arrears | $ 0 |
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 | 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
Dividends declared and paid | $ 8,000,000 | $ 8,000,000
Series E |  |
Class of Stock [Line Items] |  |
Shares Issued and Outstanding | 5,600,000 | 5,600,000
Par Value (in dollars per share) | $ 0.001 | $ 0.001
Liquidation Preference (in dollars per share) | $ 25 | $ 25
Rate per Annum | 7.875% | 7.875%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 1.97 | $ 1.97
Dividends declared and paid | $ 11,000,000 | $ 11,000,000
Series F |  |
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 | $ 25
Rate per Annum | 7.80% | 7.80%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 1.95 | $ 1.95
Dividends declared and paid | $ 7,800,000 | $ 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 | $ 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 | $ 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 | $ 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 | $ 9,400,000 | $ 9,400,000
Series J |  |
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
Rate per Annum | 4.50% | 4.50%
Equivalent to Fixed Annual Rate (in dollars per share) | $ 2.25 | $ 2.25
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%

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