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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Assumptions used for the grants | The following table illustrates the valuation assumptions used for the 2015, 2014 and 2013 grants:
| 2015 |  | 2014 |  | 2013
Expected volatility | 32 - 36% |  | 47 - 50% |  | 51%
Weighted-average expected volatility | 36% |  | 50% |  | 51%
Expected dividend yield | 1.1 - 1.2% |  | 1.1 - 1.3% |  | 1.6%
Weighted-average expected dividend yield | 1.2% |  | 1.3% |  | 1.6%
Expected term, in years | 5 |  | 6 |  | 6
Risk-free interest rate | 1.4 - 1.6% |  | 1.8 - 2.0% |  | 0.9 - 1.1%
Stock option activity | The following table summarizes the activity during the year ended December 31, 2015 for stock option awards:
| Shares |  | Weighted-Average Exercise Price
Outstanding at beginning of year | 908,030 |  |  | $ | 34.21 |
Granted | 177,020 |  |  | 66.49 |
Exercised | (54,060 | ) |  | 31.03 |
Forfeited | (10,814 | ) |  | 59.22 |
Expired | (1,218 | ) |  | 60.67 |
Outstanding at end of year | 1,018,958 |  |  | $ | 39.69 |
Exercisable at end of year | 756,470 |  |  | $ | 31.68 |
Nonvested restricted share awards activity | The following table summarizes the activity during the year ended December 31, 2015 for nonvested restricted share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 144,475 |  |  | $ | 40.51 |
Granted | 23,048 |  |  | 66.33 |
Vested | (24,245 | ) |  | 43.47 |
Forfeited | (4,459 | ) |  | 55.96 |
Nonvested at end of year | 138,819 |  |  | $ | 43.83 |
Nonvested performance share awards activity | The following table summarizes the activity during the year ended December 31, 2015 for nonvested performance share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 152,555 |  |  | $ | 49.20 |
Granted | 50,010 |  |  | 66.63 |
Vested | (38,902 | ) |  | 44.03 |
Forfeited | (22,289 | ) |  | 53.75 |
Nonvested at end of year | 141,374 |  |  | $ | 56.07 |
Nonvested restricted stock units activity | The following table summarizes the activity during the year ended December 31, 2015 for nonvested restricted stock units:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 16,549 |  |  | $ | 69.24 |
Granted | 18,061 |  |  | 64.58 |
Vested | (150 | ) |  | 65.26 |
Forfeited | (1,814 | ) |  | 65.52 |
Nonvested at end of year | 32,646 |  |  | $ | 66.89 |

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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 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=6415400&loc=d3e5070-113901 + Details
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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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- 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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