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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2011
Stock-Based Compensation [Abstract] |
Assumption used for the grants | The following table illustrates the valuation assumptions used for the 2011, 2010 and 2009 grants:
|  | 2011 |  |  | 2010 |  |  | 2009 |
Expected volatility |  |  | 49 - 50 | % |  |  | 46 - 68 | % |  |  | 38 - 66 | %
Weighted-average expected volatility |  |  | 49 | % |  |  | 46 | % |  |  | 39 | %
Expected dividend yield |  |  | 1.7 - 1.8 | % |  |  | 1.9 - 2.5 | % |  |  | 2.0 - 4.7 | %
Weighted-average expected dividend yield |  |  | 1.8 | % |  |  | 2.4 | % |  |  | 4.7 | %
Expected term, in years |  |  | 6 |  |  |  | 1 - 6 |  |  |  | 2 - 6 |
Risk-free interest rate |  |  | 1.3 - 2.5 | % |  |  | 0.4 - 2.9 | % |  |  | 1.1 - 2.8 | %
Stock options and SARs activity | The following table summarizes the activity during the year ended December 31, 2011 for stock option and SARs awards:
|  | Shares |  |  | Weighted-Average Exercise Price |
Outstanding at beginning of year |  |  | 1,402,452 |  |  | $ | 17.74 |
Granted |  |  | 153,936 |  |  |  | 40.28 |
Exercised |  |  | (242,597 | ) |  |  | 17.51 |
Forfeited |  |  | (44,871 | ) |  |  | 20.87 |
Outstanding at end of year |  |  | 1,268,920 |  |  | $ | 20.40 |
Exercisable at end of year |  |  | 694,872 |  |  | $ | 17.51 |
Nonvested restricted shares activity | The following table summarizes the activity during the year ended December 31, 2011, for nonvested restricted share awards:
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of year |  |  | 145,641 |  |  | $ | 24.50 |
Granted |  |  | 29,365 |  |  |  | 40.43 |
Vested |  |  | (18,152 | ) |  |  | 35.83 |
Forfeited |  |  | (6,773 | ) |  |  | 21.19 |
Nonvested at end of year |  |  | 150,081 |  |  | $ | 26.39 |

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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -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 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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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