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Share-Based Payments (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Weighted-Average Assumptions Used to Determine Fair Value of Stock Options | The fair values of the options granted during the years ended December 31, 2016, 2015, and 2014 have been estimated at the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| For the Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Expected volatility | 37.2 | % |  | 39.5 | % |  | 40.3 | %
Risk-free interest rate | 1.6 | % |  | 1.9 | % |  | 2.2 | %
Expected life (years) | 7.5 |  |  | 7.7 |  |  | 7.2 |
Dividend yield | 2.1 | % |  | 2.1 | % |  | 2.1 | %
The fair value of the SARs granted in conjunction with the Encompass acquisition has been estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| For the Year Ended December 31,
| 2016 |  | 2015
Expected volatility | 25.9 | % |  | 30.7 | %
Risk-free interest rate | 1.9 | % |  | 2.1 | %
Expected life (years) | 5.3 |  |  | 6.3 |
Dividend yield | — | % |  | — | %
Schedule of Stock Option Activity | A summary of our stock option activity and related information is as follows:
| Shares (In Thousands) |  | Weighted- Average Exercise Price per Share |  | Weighted- Average Remaining Life (Years) |  | Aggregate Intrinsic Value (In Millions)
Outstanding, December 31, 2015 | 2,056 |  |  | $ | 21.37 |  |  |  |  |
Granted | 186 |  |  | 36.15 |  |  |  |  |
Exercised | (563 | ) |  | 23.14 |  |  |  |  |
Forfeitures | (102 | ) |  | 37.22 |  |  |  |  |
Expirations | (2 | ) |  | 24.72 |  |  |  |  |
Outstanding, December 31, 2016 | 1,575 |  |  | 21.45 |  |  | 4.3 |  | $ | 31.3 |
Exercisable, December 31, 2016 | 1,442 |  |  | 19.94 |  |  | 3.9 |  | 30.8 |
Schedule of Restricted Stock Activity | A summary of our issued restricted stock awards is as follows (share information in thousands):
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested shares at December 31, 2015 | 842 |  |  | $ | 28.05 |
Granted | 542 |  |  | 33.56 |
Vested | (712 | ) |  | 25.63 |
Forfeited | (54 | ) |  | 35.24 |
Nonvested shares at December 31, 2016 | 618 |  |  | 35.06 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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