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Earnings Per Share (Notes) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE Basic earnings per share are computed based on the weighted average number of common shares outstanding during the period. Diluted earnings per share are computed using the weighted average number of common shares outstanding and the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Potential common shares consist of: i) unvested employee stock purchase plan shares; and ii) contingently issuable time-based and performance-based restricted stock units, along with associated dividend equivalent rights. Unvested performance-based restricted stock units and associated dividend equivalent rights are included in dilutive potential common shares only after the performance criteria have been met. For the three and nine month periods ended September 30, 2016, unvested performance-based restricted stock units and related dividend equivalent rights of approximately 306,000 were excluded from the dilutive calculation because the performance goals had not been met, with 308,000 excluded for the three and nine month periods ended September 30, 2015. Net income is the same for both the basic and diluted earnings per share computations. The denominators of the basic and diluted earnings per share computations are as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Weighted-average common shares outstanding—basic and diluted | 88,921 |  |  | 88,766 |  |  | 88,885 |  |  | 82,633 |

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