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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2011
Summary of Stock Options Issued Pursuant to Stock Incentive Plans | A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value of In-the-Money Options |
Outstanding as of December 31, 2010 |  |  | 3,510,538 |  |  | $ | 21.55 |  |  |  |  |  |  |  |  |
Granted |  |  | 70,000 |  |  |  | 29.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (232,499 | ) |  |  | 11.95 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (22,351 | ) |  |  | 20.19 |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2011 |  |  | 3,325,688 |  |  | $ | 22.38 |  |  |  | 5.14 |  |  | $ | 21,022,107 |
Exercisable as of September 30, 2011 |  |  | 2,267,032 |  |  | $ | 22.40 |  |  |  | 4.55 |  |  | $ | 15,405,992 |
Fair Value of Options Granted Estimated using the Black-Scholes Option-Pricing Model with Weighted-Average Assumptions | The fair value of options granted during the nine months ended September 30, 2011 and 2010 was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:
|  |  | September 30, |  |  |  | September 30, |
|  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2011 |  |  | September 30, 2010 |
Expected life (years) |  |  | 5.50 |  |  |  | 5.63 |
Interest rate |  |  | 1.6 | % |  |  | 2.3 | %
Volatility |  |  | 50.8 | % |  |  | 51.7 | %
Dividend yield |  |  | — |  |  |  | — |
Summary of Nonvested Long-Term Incentive Program Performance Share Awards ("LTIP performance shares") Outstanding | A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of September 30, 2011 and changes during the period are as follows:
|  |  | September 30, |  |  |  | September 30, |
Nonvested LTIP Performance Shares |  | Number of Shares at Expected Attainment |  |  | Weighted- Average Grant Date Fair Value |
Nonvested as of December 31, 2010 |  |  | 499,035 |  |  | $ | 20.57 |
Forfeited |  |  | (27,274 | ) |  |  | 18.69 |
Nonvested as of September 30, 2011 |  |  | 471,761 |  |  | $ | 20.72 |
Summary of Nonvested Restricted Share Awards ("RSAs") and Changes During the Period | A summary of nonvested restricted share awards (“RSAs”) as of September 30, 2011 and changes during the period are as follows:
|  |  | September 30, |  |  |  | September 30, |
Nonvested Restricted Share Awards |  | Number of Restricted Share Awards |  |  | Weighted-Average Grant Date Fair Value |
Nonvested as of December 31, 2010 |  |  | 192,298 |  |  | $ | 18.42 |
Awarded |  |  | 1,300 |  |  |  | 29.00 |
Vested |  |  | (79,550 | ) |  |  | 18.06 |
Forfeited |  |  | (9,000 | ) |  |  | 17.36 |
Nonvested as of September 30, 2011 |  |  | 105,048 |  |  | $ | 18.92 |

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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 -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 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 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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