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Income (Loss) per Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Income (Loss) per Share | Income (Loss) per Share Basic income (loss) per share is computed by dividing net income (loss) by the sum of the weighted-average number of common shares outstanding and the weighted-average number of shares issuable under the common stock warrants, representing 354 thousand shares during the three months ended March 31, 2018 and 352 thousand shares during the three months ended March 31, 2017, respectively. The common stock warrants are included in the calculation of basic income (loss) per share because they are issuable for minimal consideration. The following table sets forth the computation of basic and diluted income (loss) per share (in thousands, except per share amounts):
| Three Months Ended March 31,
| 2018 |  | 2017
Net income | $ | 15,185 |  |  | $ | 27,786 |
Less: Undistributed income allocated to participating securities (1) | 192 |  |  | 299 |
Net income attributable to common stockholders | 14,993 |  |  | 27,487 |
Plus: Net income effect of convertible securities | — |  |  | 2,509 |
Numerator for diluted income per common share | $ | 14,993 |  |  | $ | 29,996 |
Basic weighted-average common stock shares outstanding | 45,634 |  |  | 45,476 |
Plus: dilutive effects of common stock equivalents | 43 |  |  | 6,389 |
Diluted weighted-average common stock shares outstanding | 45,677 |  |  | 51,865 |
Basic income per common share | $ | 0.33 |  |  | $ | 0.60 |
Diluted income per common share | $ | 0.33 |  |  | $ | 0.58 |
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(1) | Participating securities include restricted stock that has been issued but has not yet vested.
For the three months ended March 31, 2018, our calculation of diluted shares outstanding excluded 46 thousand shares of unvested restricted stock and 1.3 million stock options. For the three months ended March 31, 2017, our calculation of diluted shares outstanding excluded 120 thousand shares of unvested restricted stock and 2.0 million stock options. As discussed in Note 9—Debt, we have the option of settling the 5.00% Convertible Senior Notes in cash or shares of common stock, or any combination thereof, upon conversion. For the three months ended March 31, 2018 and March 31, 2017, diluted income (loss) per share was determined using the if-converted method. Our calculation of diluted shares outstanding for the three months ended March 31, 2018 excluded 6.4 million common stock equivalents assuming our 5.00% Convertible Senior Notes had been converted on January 1, 2018.

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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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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