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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Options Activity |
| Shares under option (thousands) |  | Weighted average exercise price |  | Weighted average remaining contractual life (in years) |  | Aggregate intrinsic value (in millions)
Outstanding and exercisable at December 31, 2016 | 473 |  |  | $ | 17.47 |  |  | 0.1 |  | $ | 10.4 |
Exercised | (473 | ) |  | $ | 17.47 |  |  |  |  |
Outstanding and exercisable at March 31, 2017 | — |  |  |  |  |  |  |  |  |
Nonvested Restricted Stock Activity |
| Shares subject to restriction (thousands) |  | Weighted average price
Nonvested at December 31, 2016 | 1,429 |  |  | $ | 44.12 |
Granted | 777 |  |  | $ | 40.07 |
Vested | (453 | ) |  | $ | 57.35 |
Forfeited | (28 | ) |  | $ | 41.87 |
Nonvested at March 31, 2017 | 1,725 |  |  | $ | 39.27 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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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