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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2012
Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted | Weighted-average assumptions used to estimate the grant date fair values for stock options granted in the three month periods ended March 31, 2012 and 2011 follow:
|  | Three Months Ended March 31, |
|  | 2012 |  |  | 2011 |
Volatility |  |  | 48.72 | % |  |  | 47.43 | %
Expected term (in years) |  |  | 5.00 |  |  |  | 5.00 |
Dividend yield |  |  | 1.00 | % |  |  | 0.93 | %
Risk-free interest rate |  |  | 0.83 | % |  |  | 2.01 | %
Stock Option Activity | Stock option activity from January 1, 2012 to March 31, 2012 follows:
|  | Underlying Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2012 |  |  | 7,081,295 |  |  | $ | 20.73 |
Granted |  |  | 40,000 |  |  | $ | 19.98 |
Exercised |  |  | (13,300 | ) |  | $ | 14.64 |
Outstanding at March 31, 2012 |  |  | 7,107,995 |  |  | $ | 20.74 |
Exercisable at March 31, 2012 |  |  | 6,279,644 |  |  | $ | 20.52 |
Restricted Stock Activity | Restricted stock activity from January 1, 2012 to March 31, 2012 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock outstanding at January 1, 2012 |  |  | 1,213,799 |  |  | $ | 24.13 |
Granted |  |  | 12,000 |  |  | $ | 19.98 |
Vested |  |  | (59,459 | ) |  | $ | 15.49 |
Forfeited |  |  | (5,136 | ) |  | $ | 23.70 |
Non-vested restricted stock outstanding at March 31, 2012 |  |  | 1,161,204 |  |  | $ | 24.53 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2012 to March 31, 2012 follows:
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested restricted stock units outstanding at January 1, 2012 |  |  | 17,501 |  |  | $ | 23.47 |
Granted |  |  | — |  |  | $ | — |
Vested |  |  | — |  |  | $ | — |
Forfeited |  |  | — |  |  | $ | — |
Non-vested restricted stock units outstanding at March 31, 2012 |  |  | 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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