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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
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-SubTopic 10
-Section S99
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