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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-Average Assumptions Used To Value Options Granted |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Expected term of options |  |  | — |  |  |  | — |  |  | 6.2 years |  |  | 7.0 years |
Expected volatility |  |  | — |  |  |  | — |  |  |  | 41 | % |  |  | 40 | %
Risk-free interest rate |  |  | — |  |  |  | — |  |  |  | 2.674 | % |  |  | 2.94 | %
Dividend yield |  |  | — |  |  |  | — |  |  | zero |  |  | zero |
Summary Of Stock Options |
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  | Weighted- |  |  | Average |  |  |  |
|  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Number of |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
(in thousands, except per share data) |  | Options |  |  | Price |  |  | Term (Years) |  |  | Value |
Outstanding at December 31, 2010 |  |  | 4,825 |  |  | $ | 19.18 |  |  |  | 5.58 |  |  |  |  |
Granted |  |  | 399 |  |  | $ | 18.56 |  |  |  |  |  |  |  |  |
Exercised |  |  | (144 | ) |  | $ | 11.18 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (232 | ) |  | $ | 19.43 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2011 |  |  | 4,848 |  |  | $ | 19.36 |  |  |  | 5.26 |  |  | $ | 1,277 |
Exercisable at September 30, 2011 |  |  | 3,320 |  |  | $ | 20.67 |  |  |  | 4.08 |  |  | $ | 1,091 |
Restricted Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards |
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
(in thousands, except per share data) |  | Shares |  |  | Fair Value |
Nonvested shares outstanding at December 31, 2010 |  |  | 178 |  |  | $ | 17.17 |
Granted |  |  | 195 |  |  | $ | 18.57 |
Vested |  |  | (10 | ) |  | $ | 17.54 |
Forfeited |  |  | (20 | ) |  | $ | 17.74 |
Nonvested shares outstanding at September 30, 2011 |  |  | 343 |  |  | $ | 17.92 |
Restricted Stock Units And Phantom Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards |
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
(in thousands, except per share data) |  | Shares |  |  | Fair Value |
Nonvested shares outstanding at December 31, 2010 |  |  | 47 |  |  | $ | 17.05 |
Granted |  |  | 86 |  |  | $ | 17.77 |
Vested |  |  | (9 | ) |  | $ | 16.66 |
Forfeited |  |  | (12 | ) |  | $ | 16.87 |
Nonvested shares outstanding at September 30, 2011 |  |  | 112 |  |  | $ | 17.65 |
Performance Based Restricted Stock Unit [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Stock-Based Awards |
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
|  |  |  |  | Grant Date |
(in thousands, except per share data) |  | Shares |  |  | Fair Value |
Nonvested shares outstanding at December 31, 2010 |  |  | — |  |  |  | — |
Granted(1) |  |  | 93 |  |  | $ | 18.57 |
Forfeited |  |  | — |  |  |  | — |
Nonvested shares outstanding at September 30, 2011 |  |  | 93 |  |  | $ | 18.57 |
(1) Represents target number of shares that can vest based on the achievement of certain performance criteria.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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