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Earnings per Share | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Earnings per Share | 9. Earnings per Share Basic earnings per common share are computed by dividing net income available to common shareholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per common share are computed by dividing net income available to common shareholders by the combined weighted average number of shares of common stock outstanding and the potential dilution of stock options, warrants, RSUs, convertible senior notes and the Company’s Series A Convertible Perpetual Preferred Stock, par value $0.001 per share (“preferred stock”), outstanding during the period, if dilutive. The weighted average of potentially dilutive securities excluded from the computation of diluted earnings per share for the three- and six-month periods ending June 30, 2013 and 2012 is shown per the table below.
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2013 |  |  | June 30, 2012 |  |  | June 30, 2013 |  |  | June 30, 2012 |
Basic common stock outstanding |  |  | 18,179,570 |  |  |  | 17,636,834 |  |  |  | 18,106,564 |  |  |  | 16,629,420 |
Potentially Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares underlying the conversion of preferred stock to common stock |  |  | 10,610,714 |  |  |  | 10,714,286 |  |  |  | 10,610,714 |  |  |  | 10,714,286 |
Shares underlying the conversion of the convertible senior notes |  |  | 8,749,239 |  |  |  | — |  |  |  | 8,749,239 |  |  |  | — |
Shares underlying warrants to purchase common stock |  |  | 6,262,380 |  |  |  | 6,282,659 |  |  |  | 6,302,668 |  |  |  | 6,282,659 |
Shares underlying stock options to purchase common stock |  |  | 526,813 |  |  |  | 401,793 |  |  |  | 533,977 |  |  |  | 348,682 |
Shares underlying restricted stock units |  |  | 436,275 |  |  |  | 559,381 |  |  |  | 418,898 |  |  |  | 613,139 |
|  |  | 26,585,421 |  |  |  | 17,958,119 |  |  |  | 26,615,496 |  |  |  | 17,958,766 |
Diluted weighted shares outstanding |  |  | 44,764,991 |  |  |  | 35,594,953 |  |  |  | 44,722,060 |  |  |  | 34,588,186 |
The impact of this dilution was not reflected in the earnings per share calculations in the unaudited condensed consolidated statements of operations because the impact was anti-dilutive. The treasury method was used to determine the shares underlying warrants, stock options and RSUs for potential dilution with an average market price of $16.85 per share and $16.92 per share for the three-month periods ended June 30, 2013 and 2012, respectively, and $17.00 per share and $15.44 per share for the six-month periods ended June 30, 2013 and 2012, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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