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Equity - Additional Information (Details) (USD $) Share data in Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2013 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 8.5% Convertible perpetual preferred stock | Mar. 31, 2014 6.0% Convertible perpetual preferred stock | Mar. 31, 2014 7.0% Convertible perpetual preferred stock | Mar. 31, 2014 Treasury Stock | Mar. 31, 2013 Treasury Stock | Mar. 31, 2014 Restricted Stock | Mar. 31, 2013 Restricted Stock
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 8.50% | 6.00% | 7.00% |  |  |  |
Retirement of treasury stock (in shares) |  |  |  |  |  |  | 609 | 1,778 |  |
Retirement of treasury stock |  | $ 0 |  |  |  |  | $ (3,677,000) | $ (11,216,000) |  |
Stockholder settlement gross | 5,000,000 |  |  |  |  |  |  |  |  |
Additional paid-in capital—stockholder receivable |  | (3,750,000) | (3,750,000) |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  | 7,400,000 | 18,900,000
Stock-based compensation, capitalized |  |  |  |  |  |  |  |  | $ 1,900,000 | $ 1,600,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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