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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 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 |
Granted | 27 |  |  | $ | 41.13 |
Vested | (61 | ) |  | $ | 51.71 |
Forfeited | (28 | ) |  | $ | 38.06 |
Nonvested at June 30, 2017 | 1,663 |  |  | $ | 38.86 |
Vested | (7 | ) |  | $ | 45.09 |
Forfeited | (19 | ) |  | $ | 38.22 |
Nonvested at September 30, 2017 | 1,637 |  |  | $ | 38.85 |

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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=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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