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Earnings/ (Loss) per share - Additional information (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Earnings Per Share, Basic [Abstract] |  |
Issuance date of Series B preferred stock | August 2013 |
Issuance Date Of Series C preferred Stock | January 2014 |
Issuance Date Of Series D preferred Stock | May 2015 |
Preferred stock dividend rate series B | 7.625% |
Preferred stock dividend rate series C | 8.50% |
Preferred stock dividend rate series D | 8.75% |
Dividends paid and accrued during period | $ 7,313 | $ 5,719

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- Definition The issuance date of Series C preferred stock in MM-YYYY. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on Series B preferred stock. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on Series C preferred stock. + References No definition available. + Details
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- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. + References 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 + Details
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