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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Award Activity | The following table presents a summary of our stock option award activity for the three months ended March 31, 2017:
| Number of Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2016 | 9,531,440 |  |  | $ | 28.93 |
Granted | 726,061 |  |  | 50.99 |
Exercised | (463,376 | ) |  | 22.45 |
Forfeited, canceled or expired | (45,795 | ) |  | 41.54 |
Outstanding at March 31, 2017 | 9,748,330 |  |  | 30.82 |
Summary of Restricted Stock Award Activity | The following table presents a summary of restricted stock award activity for the three months ended March 31, 2017:
| Shares of Restricted Stock (“RS”) |  | Restricted Stock Units (“RSU”)
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 1,250,343 |  |  | $ | 41.51 |  |  | 361,117 |  |  | $ | 28.26 |
Granted | 115,017 |  |  | 50.60 |  |  | 9,046 |  |  | 52.05 |
RS’s Vested/RSU’s Issued | (101,913 | ) |  | 40.99 |  |  | — |  |  | — |
Forfeited | (29,316 | ) |  | 41.16 |  |  | — |  |  | — |
Outstanding at March 31, 2017 | 1,234,131 |  |  | 42.40 |  |  | 370,163 |  |  | 28.84 |
Schedule of Performance Unit Awards | The following table presents a summary of the activity for performance unit awards to be settled in shares for the three months ended March 31, 2017:
| Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 6,255,178 |  |  | $ | 0.78 |
Granted | 2,584,750 |  |  | 0.92 |
Exercised | (1,854,728 | ) |  | 0.85 |
Canceled | — |  |  | — |
Outstanding at March 31, 2017 | 6,985,200 |  |  | 0.81 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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