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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Equity Awards Activity | A summary of the equity awards authorized and available for future grants under the 2015 Plan is as follows:
Available for future grants at December 31, 2016 | 2,164,297 |
Newly authorized options | — |
Granted | (726,862 | )
Cancellation and forfeitures | — |
Plan termination | — |
Available for future grants at December 31, 2017 | 1,437,435 |
Summary of SARs Activity | A summary of the Company’s SARs outstanding under the 2015 Plan is as follows:
| 2017 |  | 2016 |  | 2015
SARs | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price
Outstanding at beginning of year | 1,740,786 |  |  | $ | 56.15 |  |  | 1,397,611 |  |  | $ | 56.78 |  |  | 1,292,142 |  |  | $ | 42.20 |
Granted | 402,029 |  |  | 98.87 |  |  | 627,971 |  |  | 52.13 |  |  | 332,159 |  |  | 107.31 |
Exercised | (250,326 | ) |  | 48.66 |  |  | (160,946 | ) |  | 35.37 |  |  | (179,702 | ) |  | 40.71 |
Forfeited | (66,550 | ) |  | 75.38 |  |  | (115,215 | ) |  | 65.74 |  |  | (45,441 | ) |  | 75.26 |
Expired | (7,948 | ) |  | 108.20 |  |  | (8,635 | ) |  | 88.65 |  |  | (1,547 | ) |  | 47.11 |
Outstanding at end of year | 1,817,991 |  |  | $ | 65.73 |  |  | 1,740,786 |  |  | $ | 56.15 |  |  | 1,397,611 |  |  | $ | 56.78 |
Exercisable at end of year | 874,942 |  |  | $ | 50.86 |  |  | 828,754 |  |  | $ | 45.14 |  |  | 736,075 |  |  | $ | 35.90 |
Weighted-Average Assumptions Used for Grants of SARs | The following table shows the weighted-average assumptions used for grants of SARs, as well as the fair value of the grants based on those assumptions:
| 2017 |  | 2016 |  | 2015
Expected dividend yield | 0% |  | 0% |  | 0%
Forfeiture rate | 9.37% |  | 9.01% |  | 10.24%
Volatility | 35.49% |  | 43.14% |  | 33.98%
Risk free interest rate | 1.77% |  | 1.29% |  | 1.53%
Range of interest rates | 0.71%-2.41% |  | 0.25%-1.75% |  | 0.02% - 2.14%
Expected weighted-average life (in years) | 4.13 |  | 5.33 |  | 5.32
Fair value of SARs granted | $12.01 |  | $12.65 |  | $11.63
Weighted-average grant date fair value of SARs granted (per underlying share) | $29.86 |  | $20.18 |  | $35.00
Summary of Outstanding and Exercisable Options | The following table summarizes information about non-qualified stock options outstanding at December 31, 2017:
| Outstanding |  | Exercisable
Aggregate intrinsic value (in millions) | $ | 1 |  |  | $ | 1 |
Weighted-average remaining contractual term (in years) | 0.70 |  |  | 0.70 |
The following table summarizes information about SARs outstanding at December 31, 2017:
| Outstanding |  | Exercisable
Aggregate intrinsic value (in millions) | $ | 70 |  |  | $ | 47 |
Weighted-average remaining contractual term (in years) | 6.1 |  |  | 4.7 |
Summary of Restricted Stock Award Activity | A summary of information relative to the Company’s restricted stock awards is as follows:
|  | 2017 |  | 2016 |  | 2015
Restricted Stock Awards |  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding at beginning of year |  | 622,814 |  |  | $ | 70.19 |  |  | 566,447 |  |  | $ | 77.68 |  |  | 691,621 |  |  | $ | 60.06 |
Granted |  | 199,629 |  |  | 98.90 |  |  | 389,193 |  |  | 51.93 |  |  | 185,782 |  |  | 107.17 |
Released |  | (165,846 | ) |  | 75.90 |  |  | (275,229 | ) |  | 59.39 |  |  | (253,801 | ) |  | 51.95 |
Forfeited |  | (27,955 | ) |  | 72.81 |  |  | (57,597 | ) |  | 70.50 |  |  | (57,155 | ) |  | 75.11 |
Outstanding at end of year |  | 628,642 |  |  | $ | 77.70 |  |  | 622,814 |  |  | $ | 70.19 |  |  | 566,447 |  |  | $ | 77.68 |
Summary of Performance Share Award Activity | A summary of information relative to the Company’s performance awards is as follows:
|  | 2017 |  | 2016 |  | 2015
Performance Share Awards |  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding at beginning of year |  | 379,226 |  |  | $ | 70.14 |  |  | 332,630 |  |  | $ | 73.40 |  |  | 374,180 |  |  | $ | 61.53 |
Granted |  | 79,423 |  |  | 98.97 |  |  | 172,024 |  |  | 51.01 |  |  | 106,411 |  |  | 75.77 |
Released |  | (2,029 | ) |  | 62.70 |  |  | (111,325 | ) |  | 46.58 |  |  | (120,000 | ) |  | 38.67 |
Forfeited |  | (190,873 | ) |  | 73.09 |  |  | (14,103 | ) |  | 75.73 |  |  | (27,961 | ) |  | 73.45 |
Outstanding at end of year |  | 265,747 |  |  | $ | 77.04 |  |  | 379,226 |  |  | $ | 70.14 |  |  | 332,630 |  |  | $ | 73.40 |
Summary of Non-qualified Option Activity | A summary of the Company’s options outstanding under the 2006 Plan is as follows:
| 2017 |  | 2016 |  | 2015
Non-qualified Options | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price |  | Shares |  | Weighted- Average Exercise Price
Outstanding at beginning of year | 154,551 |  |  | $ | 35.96 |  |  | 204,434 |  |  | $ | 36.66 |  |  | 415,960 |  |  | $ | 40.19 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | (132,905 | ) |  | 36.86 |  |  | (47,393 | ) |  | 38.60 |  |  | (209,976 | ) |  | 43.53 |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expired | (5,941 | ) |  | 41.25 |  |  | (2,490 | ) |  | 43.35 |  |  | (1,550 | ) |  | 51.62 |
Outstanding at end of year | 15,705 |  |  | $ | 26.34 |  |  | 154,551 |  |  | $ | 35.96 |  |  | 204,434 |  |  | $ | 36.66 |
Exercisable at end of year | 15,705 |  |  | $ | 26.34 |  |  | 154,551 |  |  | $ | 35.96 |  |  | 204,434 |  |  | $ | 36.66 |

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