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Earnings per Common Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings per Common Share | Earnings per Common Share The calculation of basic and diluted EPS was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands, except per share data)
Basic earnings per Class A common share |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income | $ | 29,827 |  |  | $ | 19,266 |  |  | $ | 99,858 |  |  | $ | 60,020 |
Denominator: |  |  |  |  |  |  |
Weighted-average Class A shares issued and outstanding | 52,105 |  |  | 50,013 |  |  | 51,774 |  |  | 50,234 |
Basic earnings per Class A common share | $ | 0.57 |  |  | $ | 0.39 |  |  | $ | 1.93 |  |  | $ | 1.19 |
Diluted earnings per Class A common share |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income | $ | 29,827 |  |  | $ | 19,266 |  |  | $ | 99,858 |  |  | $ | 60,020 |
Denominator: |  |  |  |  |  |  |
Weighted-average Class A shares issued and outstanding | 52,105 |  |  | 50,013 |  |  | 51,774 |  |  | 50,234 |
Dilutive potential common shares: |  |  |  |  |  |  |
Stock options | 343 |  |  | 759 |  |  | 441 |  |  | 706 |
Restricted stock units | 1,236 |  |  | 1,418 |  |  | 1,296 |  |  | 1,368 |
Performance based restricted stock units | 705 |  |  | 259 |  |  | 789 |  |  | 268 |
Employee stock purchase plan | 1 |  |  | 3 |  |  | 1 |  |  | 1 |
Diluted weighted-average Class A shares issued and outstanding | 54,390 |  |  | 52,452 |  |  | 54,301 |  |  | 52,577 |
Diluted earnings per Class A common share | $ | 0.55 |  |  | $ | 0.37 |  |  | $ | 1.84 |  |  | $ | 1.14 |
For the periods presented, we excluded certain restricted stock units and stock options outstanding (as applicable) which could potentially dilute basic EPS in the future, from the computation of diluted EPS as their effect was anti-dilutive. Additionally, we have excluded any performance based restricted stock units for which the performance contingency has not been met as of the end of the period. The following table shows the weighted-average number of shares excluded from the diluted EPS calculation:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Class A common stock |  |  |  |  |  |  |
Options to purchase Class A common stock | — |  |  | 56 |  |  | — |  |  | 73 |
Performance based restricted stock units | 134 |  |  | 424 |  |  | 101 |  |  | 216 |
Total options and restricted stock units | 134 |  |  | 480 |  |  | 101 |  |  | 289 |

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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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