| Net Income Per Share |
Net Income Per Share The Company’s basic net income per share amounts have been computed by dividing net income by the weighted average number of shares of Common Stock and Class A Stock outstanding. Net income per share is presented on a combined basis, inclusive of Common Stock and Class A Stock outstanding, as each class of stock has equivalent economic rights. Diluted net income per share includes the potential dilutive effect of other securities as if such securities were converted or exercised during the period, when the effect is dilutive. The calculations of basic and diluted net income per share are as follows: | | | | | | | | | | | | Three Months Ended | | | September 30, | | | 2013 | | 2012 | Net income - basic | | $ | 141,306 |
| | $ | 191,468 |
| Effect of dilutive securities: | | | | | Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs | | 4,678 |
| | 7,374 |
| Net income - diluted | | $ | 145,984 |
| | $ | 198,842 |
| | | | | | (Shares in thousands) | | | | | Weighted average shares - basic | | 98,226 |
| | 95,012 |
| Effect of dilutive securities: | | | | | Stock options | | 10,379 |
| | 14,106 |
| Restricted stock | | 462 |
| | 797 |
| Convertible senior notes | | 4,761 |
| | 4,761 |
| Warrants | | 2,885 |
| | 1,154 |
| Dilutive potential shares | | 18,487 |
| | 20,818 |
| Weighted average shares - diluted | | 116,713 |
| | 115,830 |
| | | | | | Net income per share - basic | | $ | 1.44 |
| | $ | 2.02 |
| Net income per share - diluted | | $ | 1.25 |
| | $ | 1.72 |
|
| | | | | | | | | | | | Nine Months Ended | | | September 30, | | | 2013 | | 2012 | Net income - basic | | $ | 327,556 |
| | $ | 279,862 |
| Effect of dilutive securities: | | | | | Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs | | 13,857 |
| |
|
| Net income - diluted | | $ | 341,413 |
| | $ | 279,862 |
| | | | | | (Shares in thousands) | | | | | Weighted average shares - basic | | 97,602 |
| | 94,349 |
| Effect of dilutive securities: | | | | | Stock options | | 10,220 |
| | 14,080 |
| Restricted stock | | 415 |
| | 699 |
| Convertible senior notes | | 4,761 |
| |
|
| Warrants | | 2,556 |
| | 652 |
| Dilutive potential shares | | 17,952 |
| | 15,431 |
| Weighted average shares - diluted | | 115,554 |
| | 109,780 |
| | | | | | Net income per share - basic | | $ | 3.36 |
| | $ | 2.97 |
| Net income per share - diluted | | $ | 2.95 |
| | $ | 2.55 |
|
Shares which have been excluded from the September 30, 2013 and 2012 diluted per share amounts because their effect would have been antidilutive, include the following: | | | | | | | | | | Three Months Ended | | | September 30, | (Shares in thousands) | | 2013 | | 2012 | Stock options | | 135 |
| | 175 |
|
| | | | | | | | | | Nine Months Ended | | | September 30, | (Shares in thousands) | | 2013 | | 2012 | Stock options | | 1,265 |
| | 91 |
| Convertible senior notes | |
|
| | 4,761 |
|
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