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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
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, 2018:
| Number of Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2017 | 8,465,398 |  |  | $ | 33.74 |
Granted | 529,197 |  |  | 64.79 |
Exercised | (477,086 | ) |  | 24.68 |
Forfeited or expired | (4,512 | ) |  | 49.94 |
Outstanding at March 31, 2018 | 8,512,997 |  |  | 36.17 |
Summary of Restricted Stock Award Activity | The following table presents a summary of restricted stock award activity for the three months ended March 31, 2018:
| 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, 2017 | 1,188,662 |  |  | $ | 45.07 |  |  | 285,164 |  |  | $ | 29.95 |
Granted | 94,592 |  |  | 64.79 |  |  | 6,924 |  |  | 67.75 |
RS’s Vested/RSU’s Issued | (123,918 | ) |  | 45.06 |  |  | — |  |  | — |
Forfeited | (24,639 | ) |  | 44.62 |  |  | — |  |  | — |
Outstanding at March 31, 2018 | 1,134,697 |  |  | 46.72 |  |  | 292,088 |  |  | 30.85 |
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, 2018:
| Number of Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 6,851,542 |  |  | $ | 0.81 |
Granted | 3,830,000 |  |  | 0.83 |
Vested | (2,052,959 | ) |  | 0.95 |
Forfeited | (10,000 | ) |  | 0.92 |
Outstanding at March 31, 2018 | 8,618,583 |  |  | 0.79 |

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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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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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