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Net Income/(Loss) per Share | 6 Months Ended | 12 Months Ended
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Jun. 30, 2015 | Dec. 31, 2014
Orbitz |  |
Entity Information [Line Items] |  |
Net Income per Share | Net Income/(Loss) per Share We calculate basic net income/(loss) per share by dividing the net income/(loss) for the period by the weighted-average number of shares outstanding during the period. Diluted net income/(loss) per share is calculated by dividing the net income/(loss) for the period by the weighted-average number of common shares outstanding and potentially dilutive common shares outstanding during the period. Potentially dilutive common shares are determined by the application of the treasury stock method. The following table presents the weighted-average shares outstanding used in the calculation of net income/(loss) per share:
| Three Months Ended June 30, |  | Six months ended June 30,
Weighted-Average Shares Outstanding | 2015 |  | 2014 |  | 2015 |  | 2014
Basic | 112,418,132 |  |  | 110,218,036 |  |  | 112,007,027 |  |  | 109,907,641 |
Diluted effect of: |  |  |  |  |  |  |
Restricted stock units | — |  |  | 2,318,956 |  |  | — |  |  | 1,852,820 |
Performance-based restricted stock units | — |  |  | 2,095,044 |  |  | — |  |  | 2,255,755 |
Stock options | — |  |  | 447,142 |  |  | — |  |  | 457,868 |
Diluted | 112,418,132 |  |  | 115,079,178 |  |  | 112,007,027 |  |  | 114,474,084 |
The following equity awards were not included in the diluted net income/(loss) per share calculation because they would have had an antidilutive effect:
| Three Months Ended June 30, |  | Six months ended June 30,
Antidilutive Equity Awards | 2015 |  | 2014 |  | 2015 |  | 2014
Restricted stock units | 4,288,652 |  |  | 936,427 |  |  | 4,141,535 |  |  | 618,421 |
Performance-based restricted stock units | 1,798,277 |  |  | 410,445 |  |  | 1,933,003 |  |  | 269,851 |
Stock options | 787,017 |  |  | — |  |  | 919,260 |  |  | — |
Total | 6,873,946 |  |  | 1,346,872 |  |  | 6,993,798 |  |  | 888,272 |
| Net Income/(Loss) per Share We calculate basic net income/(loss) per share by dividing the net income/(loss) for the period by the weighted-average number of shares outstanding during the period. The weighted-average number of shares includes common shares outstanding and deferred stock units, which are immediately vested and non-forfeitable. Diluted net income/(loss) per share is calculated by dividing the net income/(loss) for the period by the weighted-average number of common shares outstanding and potentially dilutive common shares outstanding during the period. Potentially dilutive common shares are determined by the application of the treasury stock method. The following table presents the weighted-average shares outstanding used in the calculation of net income/(loss) per share:
| Year Ended December 31,
Weighted-Average Shares Outstanding | 2014
Basic | 110,537,992 |
Diluted effect of: |
Restricted stock units | 1,367,392 |
Performance-based restricted stock units | 1,969,674 |
Stock options | 469,382 |
Diluted | 114,344,440 |
The following equity awards were not included in the diluted net income/(loss) per share calculation because they would have had an antidilutive effect:
| Year Ended December 31,
Antidilutive Equity Awards | 2014
Restricted stock units | 704,809 |
Performance-based restricted stock units | 239,725 |
Stock options | — |
Total | 944,534 |

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