Stockholders' Equity Common Stock Rollforward (Details) |
3 Months Ended | |||||
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Nov. 01, 2017
shares
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Mar. 31, 2018
shares
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Mar. 31, 2017
shares
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Dec. 31, 2017
shares
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Oct. 31, 2017
shares
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Dec. 31, 2016
shares
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| Increase (Decrease) in Common Stock Outstanding [Roll Forward] | ||||||
| Common shares outstanding at beginning of period (in shares) | 174,496,587 | 173,826,163 | ||||
| Number of shares of common stock issued during period (in shares) | 4,921 | 5,633 | ||||
| Number of shares of restricted common stock issued during period (in shares) | 933,270 | 624,711 | ||||
| Common shares outstanding at end of period (in shares) | 175,434,778 | 174,456,507 | ||||
| Reverse stock split, conversion ratio | 0.50 | |||||
| Common shares authorized (in shares) | 450,000,000 | 450,000,000 | 450,000,000 | 900,000,000 | ||
| Number of nonvested restricted common shares outstanding (in shares) | 1,739,397 | 1,473,336 | 1,284,010 | 1,319,712 | ||
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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