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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of Stock Options Issued under Various Stock Incentive Plans | A summary of stock options issued under the various Stock Incentive Plans previously described and changes 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, December 31, 2008 |  |  | 3,428,297 |  |  | $ | 21.69 |  |  |  |  |  |  |  |  |
Granted |  |  | 505,183 |  |  |  | 16.17 |  |  |  |  |  |  |  |  |
Exercised |  |  | (150,134 | ) |  |  | 12.06 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (125,606 | ) |  |  | 31.98 |  |  |  |  |  |  |  |  |
Expired |  |  | (100,867 | ) |  |  | 29.82 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2009 |  |  | 3,556,873 |  |  |  | 20.72 |  |  |  |  |  |  |  |  |
Granted |  |  | 338,950 |  |  |  | 24.48 |  |  |  |  |  |  |  |  |
Exercised |  |  | (235,986 | ) |  |  | 13.34 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (106,625 | ) |  |  | 18.11 |  |  |  |  |  |  |  |  |
Expired |  |  | (42,674 | ) |  |  | 30.31 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2010 |  |  | 3,510,538 |  |  |  | 21.55 |  |  |  |  |  |  |  |  |
Granted |  |  | 367,202 |  |  |  | 28.95 |  |  |  |  |  |  |  |  |
Exercised |  |  | (361,093 | ) |  |  | 12.40 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (26,591 | ) |  |  | 20.53 |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2011 |  |  | 3,490,056 |  |  | $ | 23.28 |  |  |  | 5.37 |  |  | $ | 21,943,485 |
Exercisable, December 31, 2011 |  |  | 2,289,018 |  |  | $ | 22.88 |  |  |  | 4.62 |  |  | $ | 16,297,256 |
Weighted-Average Assumptions used to Estimate Fair Value of Options Granted using Black-Scholes Option-Pricing Model | The fair value of options granted in the respective fiscal years was estimated on the date of grant using the Black-Scholes option-pricing model, a pricing model acceptable under ASC 718, with the following weighted-average assumptions:
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Years Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Expected life (years) |  |  | 5.9 |  |  |  | 5.9 |  |  |  | 6.0 |
Risk-free interest rate |  |  | 1.4 | % |  |  | 2.3 | % |  |  | 3.0 | %
Expected volatility |  |  | 50.6 | % |  |  | 50.8 | % |  |  | 53.2 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | —
Summary of Nonvested LTIP Performance Shares | A summary of the nonvested LTIP Performance Shares is as follows:
|  |  | September 30, |  |  |  | September 30, |
|  | Number of |  |  | Weighted- |
|  | Shares at |  |  | Average |
|  | Expected |  |  | Grant Date |
Nonvested LTIP Performance Shares |  | Attainment |  |  | Fair Value |
Nonvested at December 31, 2008 |  |  | — |  |  | $ | — |
Granted |  |  | 216,150 |  |  |  | 16.52 |
Nonvested at December 31, 2009 |  |  | 216,150 |  |  |  | 16.52 |
Granted |  |  | 207,180 |  |  |  | 26.29 |
Forfeited or expired |  |  | (25,620 | ) |  |  | 16.52 |
Change in expected attainment for 2009 grants |  |  | 101,325 |  |  |  | 16.52 |
Nonvested at December 31, 2010 |  |  | 499,035 |  |  |  | 20.57 |
Granted |  |  | 237,751 |  |  |  | 28.94 |
Forfeited or expired |  |  | (36,682 | ) |  |  | 18.92 |
Change in expected attainment for 2009 and 2010 grants |  |  | 231,468 |  |  |  | 22.71 |
Nonvested at December 31, 2011 |  |  | 931,571 |  |  | $ | 23.33 |
Summary of Nonvested RSAs | A summary of nonvested RSAs are as follows:
|  |  | September 30, |  |  |  | September 30, |
|  | Restricted |  |  | Grant Date |
Nonvested Restricted Share Awards |  | Share Awards |  |  | Fair Value |
Nonvested at December 31, 2008 |  |  | 462,400 |  |  | $ | 17.97 |
Granted |  |  | 23,500 |  |  |  | 16.65 |
Vested |  |  | (115,602 | ) |  |  | 17.97 |
Forfeited or expired |  |  | (55,750 | ) |  |  | 17.54 |
Nonvested at December 31, 2009 |  |  | 314,548 |  |  |  | 17.94 |
Granted |  |  | 25,950 |  |  |  | 22.19 |
Vested |  |  | (95,014 | ) |  |  | 17.81 |
Forfeited or expired |  |  | (53,186 | ) |  |  | 18.52 |
Nonvested at December 31, 2010 |  |  | 192,298 |  |  |  | 18.42 |
Granted |  |  | 6,300 |  |  |  | 28.95 |
Vested |  |  | (86,325 | ) |  |  | 18.31 |
Forfeited or expired |  |  | (12,250 | ) |  |  | 17.52 |
Nonvested at December 31, 2011 |  |  | 100,023 |  |  | $ | 19.29 |

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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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