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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation [Abstract] |
Assumptions used for the grants | The following table illustrates the valuation assumptions used for the 2014, 2013 and 2012 grants:
| 2014 |  | 2013 |  | 2012
Expected volatility | 47 - 50% |  | 51% |  | 51 - 52%
Weighted-average expected volatility | 50% |  | 51% |  | 52%
Expected dividend yield | 1.1 - 1.3% |  | 1.6% |  | 1.6 - 1.7%
Weighted-average expected dividend yield | 1.3% |  | 1.6% |  | 1.7%
Expected term, in years | 6 |  | 6 |  | 0.2 - 6
Risk-free interest rate | 1.8 - 2.0% |  | 0.9 - 1.1% |  | 0.1 - 1.1%
Stock option activity | The following table summarizes the activity during the year ended December 31, 2014 for stock option awards:
| Shares |  | Weighted-Average Exercise Price
Outstanding at beginning of year | 877,322 |  |  | $ | 30.42 |
Granted | 118,359 |  |  | 61.83 |
Exercised | (74,852 | ) |  | 30.31 |
Forfeited | (12,799 | ) |  | 52.55 |
Outstanding at end of year | 908,030 |  |  | $ | 34.21 |
Exercisable at end of year | 677,790 |  |  | $ | 27.74 |
Nonvested restricted shares activity | The following table summarizes the activity during the year ended December 31, 2014, for nonvested restricted share awards:
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at beginning of year | 150,943 |  |  | $ | 37.89 |
Granted | 21,417 |  |  | 62.48 |
Vested | (20,303 | ) |  | 40.38 |
Forfeited | (7,582 | ) |  | 50.87 |
Nonvested at end of year | 144,475 |  |  | $ | 40.51 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights 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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