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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2011
Weighted-Average Assumptions Used to Estimate the Grant Date Fair Values for Stock Options Granted | Treasury yields. Weighted-average assumptions used to estimate the grant date fair values for stock options granted in the three and six month periods ended June 30, 2011 and 2010 follow:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Volatility |  |  | 45.82 | % |  |  | 45.92 | % |  |  | 45.97 | % |  |  | 45.98 | %
Expected term (in years) |  |  | 5.00 |  |  |  | 5.00 |  |  |  | 5.00 |  |  |  | 5.00 |
Dividend yield |  |  | 0.64 | % |  |  | 1.35 | % |  |  | 0.67 | % |  |  | 1.35 | %
Risk-free interest rate |  |  | 2.38 | % |  |  | 2.46 | % |  |  | 2.34 | % |  |  | 2.47 | %
Stock Option Activity | Stock option activity from January 1, 2011 to June 30, 2011 follows:
|  | Underlying Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2011 |  |  | 7,710,102 |  |  | $ | 19.58 |
Granted |  |  | 419,500 |  |  | $ | 30.28 |
Exercised |  |  | (748,002 | ) |  | $ | 17.39 |
Outstanding at June 30, 2011 |  |  | 7,381,600 |  |  | $ | 20.41 |
Exercisable at June 30, 2011 |  |  | 6,027,308 |  |  | $ | 20.68 |
Restricted Stock Activity | Restricted stock activity from January 1, 2011 to June 30, 2011 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock outstanding at January 1, 2011 |  |  | 1,114,051 |  |  | $ | 16.05 |
Granted |  |  | 767,300 |  |  | $ | 30.71 |
Vested |  |  | (492,714 | ) |  | $ | 18.20 |
Forfeited |  |  | (19,282 | ) |  | $ | 19.62 |
Non-vested restricted stock outstanding at June 30, 2011 |  |  | 1,369,355 |  |  | $ | 23.44 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2011 to June 30, 2011 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock units outstanding at January 1, 2011 |  |  | 17,834 |  |  | $ | 19.73 |
Granted |  |  | 10,000 |  |  | $ | 30.63 |
Vested |  |  | (10,333 | ) |  | $ | 23.94 |
Forfeited |  |  | — |  |  | $ | — |
Non-vested restricted stock units outstanding at June 30, 2011 |  |  | 17,501 |  |  | $ | 23.47 |

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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 changes in outstanding nonvested shares. + 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 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 -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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