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Equity - Preferred Stock Dividends (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |
Dividends satisfied in shares of common stock | $ 16,188 | $ 0 | $ 0
8.5% Convertible perpetual preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends paid in cash | 11,262 | 22,525 | 22,525
Dividends satisfied in shares of common stock | 11,262 | 0 | 0
Accrued dividends at period end | 8,447 | 8,447 | 8,447
7.0% Convertible perpetual preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends paid in cash | 0 | 21,000 | 21,000
Dividends satisfied in shares of common stock | 10,500 | 0 | 0
Accrued dividends at period end | 13,125 | 2,625 | 2,625
Dividends in arrears | 10,500 | 0 | 0
6.0% Convertible perpetual preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends paid in cash | 0 | 12,000 | 12,000
Accrued dividends at period end | $ 0 | $ 0 | $ 5,500

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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