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Equity - Preferred Stock Dividends, Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 17, 2015 | May. 15, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
8.5% Convertible perpetual preferred stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Convertible perpetual preferred stock dividends (in shares) |  |  | 18.6 |  |
Percentage multiplier used in calculation of value of shares issued |  |  | 95.00% |  |
Market value of common stock issued as dividends | $ 9.5 |  |  |  |
Common shares issued, value per preferred share (usd per share) | $ 3.58 |  |  |  |
Reduction to preferred stock dividends |  |  | $ 1.8 |  |
Preferred stock, dividend rate, percentage |  |  | 8.50% | 8.50% | 8.50%
7.0% Convertible perpetual preferred stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Convertible perpetual preferred stock dividends (in shares) |  |  | 5.7 |  |
Percentage multiplier used in calculation of value of shares issued |  |  | 95.00% |  |
Market value of common stock issued as dividends |  | $ 6.7 |  |  |
Common shares issued, value per preferred share (usd per share) |  | $ 2.23 |  |  |
Reduction to preferred stock dividends |  |  | $ 3.8 |  |
Preferred stock, dividend rate, percentage |  |  | 7.00% | 7.00% | 7.00%
6.0% Convertible perpetual preferred stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 6.00% | 6.00%

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- Definition Number of shares of common stock issued as dividends during the period. Excludes stock splits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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