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Common Shares And Stock-Based Awards Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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, 2008 |  |  | 5,838 |  |  | $ | 18.43 |  |  |  |  |  |  |
Granted |  |  | 584 |  |  | $ | 18.39 |  |  |  |  |  |  |
Exercised |  |  | (366 | ) |  | $ | 9.85 |  |  |  |  |  |  |
Forfeited or expired |  |  | (525 | ) |  | $ | 16.26 |  |  |  |  |  |  |
Outstanding at December 31, 2009 |  |  | 5,531 |  |  | $ | 19.20 |  |  |  |  |  |  |
Granted |  |  | 61 |  |  | $ | 19.41 |  |  |  |  |  |  |
Exercised |  |  | (290 | ) |  | $ | 11.21 |  |  |  |  |  |  |
Forfeited or expired |  |  | (477 | ) |  | $ | 24.32 |  |  |  |  |  |  |
Outstanding at December 31, 2010 |  |  | 4,825 |  |  | $ | 19.18 |  |  |  |  |  |  |
Granted |  |  | 399 |  |  | $ | 18.56 |  |  |  |  |  |  |
Exercised |  |  | (257 | ) |  | $ | 9.98 |  |  |  |  |  |  |
Forfeited or expired |  |  | (442 | ) |  | $ | 18.74 |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 4,525 |  |  | $ | 19.69 |  |  |  | 5.05 |  |  | $ | 1,128 |
Exercisable at December 31, 2011 |  |  | 3,730 |  |  | $ | 20.32 |  |  |  | 4.39 |  |  | $ | 913 |
Summary Of Stock-Based Awards |
(in thousands, except per share data) |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Outstanding at December 31, 2008 |  |  | 140 |  |  | $ | 13.99 |
Granted |  |  | 151 |  |  | $ | 19.11 |
Forfeited |  |  | (1 | ) |  | $ | 12.64 |
Outstanding at December 31, 2009 |  |  | 290 |  |  | $ | 16.67 |
Vested |  |  | (105 | ) |  | $ | 15.81 |
Forfeited |  |  | (7 | ) |  | $ | 17.02 |
Outstanding at December 31, 2010 |  |  | 178 |  |  | $ | 17.17 |
Granted |  |  | 195 |  |  | $ | 18.57 |
Vested |  |  | (66 | ) |  | $ | 16.66 |
Forfeited |  |  | (63 | ) |  | $ | 17.92 |
Outstanding at December 31, 2011 |  |  | 244 |  |  | $ | 18.23 |
Summary Of Restricted Stock Units And Phantom Stock Awards |
(in thousands, except per share data) |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Outstanding at December 31, 2008 |  |  | 34 |  |  | $ | 12.64 |
Granted |  |  | 49 |  |  | $ | 19.11 |
Forfeited |  |  | (2 | ) |  | $ | 14.07 |
Outstanding at December 31, 2009 |  |  | 81 |  |  | $ | 16.50 |
Vested |  |  | (26 | ) |  | $ | 15.33 |
Forfeited |  |  | (8 | ) |  | $ | 17.04 |
Outstanding at December 31, 2010 |  |  | 47 |  |  | $ | 17.05 |
Granted |  |  | 86 |  |  | $ | 17.77 |
Vested |  |  | (32 | ) |  | $ | 16.66 |
Forfeited |  |  | (18 | ) |  | $ | 17.37 |
Outstanding at December 31, 2011 |  |  | 83 |  |  | $ | 17.88 |
Performance Based Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary Of Activities Related To Company's Performance Based Restricted Stock Unit Awards |
(in thousands, except per share data) |  | Shares |  |  | Weighted- Average Grant Date Fair Value |
Outstanding at December 31, 2010 |  |  | — |  |  |  | — |
Granted(1) |  |  | 93 |  |  | $ | 18.57 |
Forfeited |  |  | (25 | ) |  | $ | 18.57 |
Outstanding at December 31, 2011 |  |  | 68 |  |  | $ | 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 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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + 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 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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