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Share-Based Compensation And Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-Based Compensation And Benefit Plans [Abstract] |
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Outstanding Options (1) |  |  | Exercisable Options (1) |
Range of Exercise Prices |  | Number |  |  | Weighted Average Price |  |  | Number |  |  | Weighted Average Price |
$30.06-$41.16 |  |  | 470,019 |  |  | $ | 32.06 |  |  |  | 176,314 |  |  | $ | 35.39 |
$42.90-$45.53 |  |  | 466,060 |  |  |  | 44.32 |  |  |  | 428,797 |  |  |  | 44.36 |
$48.02-$73.32 |  |  | 403,457 |  |  |  | 51.79 |  |  |  | 253,068 |  |  |  | 54.03 |
Total options |  |  | 1,339,536 |  |  | $ | 42.27 |  |  |  | 858,179 |  |  | $ | 45.37 |
(1) | The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.
Assumptions Used For Options Granted |
|  | September 30, |  |  | September 30, |
|  | Year Ended December 31, |
|  | 2010 |  | 2009 |
Weighted average fair value of options granted |  | $11.69 |  | $ | 3.06 |
Expected volatility |  | 35.6% – 39.2% |  |  | 33.0 | %
Risk-free interest rate |  | 3.6% – 3.7% |  |  | 2.6 | %
Expected dividend yield |  | 4.1% – 4.4% |  |  | 9.3 | %
Expected life (in years) |  | 7– 9 |  |  | 7 |
Summary Of Share Incentive Plans |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Options Outstanding |  |  | Weighted Average Exercise / Grant Price |  |  | Nonvested Share Awards Outstanding |  |  | Weighted Average Exercise / Grant Price |
Options and nonvested share awards outstanding at December 31, 2008 |  |  | 1,536,527 |  |  | $ | 44.96 |  |  |  | 520,285 |  |  | $ | 59.40 |
2009 Activity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 489,509 |  |  |  | 30.06 |  |  |  | 329,018 |  |  |  | 30.11 |
Exercised/Vested |  |  | (18,521 | ) |  |  | 33.45 |  |  |  | (188,892 | ) |  |  | 53.76 |
Forfeited |  |  | (24,157 | ) |  |  | 45.08 |  |  |  | (65,258 | ) |  |  | 51.06 |
Net activity |  |  | 446,831 |  |  |  |  |  |  |  | 74,868 |  |  |  |  |
Balance at December 31, 2009 |  |  | 1,983,358 |  |  | $ | 41.39 |  |  |  | 595,153 |  |  | $ | 46.20 |
2010 Activity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 55,895 |  |  |  | 43.94 |  |  |  | 372,661 |  |  |  | 40.05 |
Exercised/Vested |  |  | (141,213 | ) |  |  | 32.54 |  |  |  | (214,923 | ) |  |  | 49.17 |
Forfeited |  |  | (50,904 | ) |  |  | 46.65 |  |  |  | (11,386 | ) |  |  | 39.64 |
Net activity |  |  | (136,222 | ) |  |  |  |  |  |  | 146,352 |  |  |  |  |
Balance at December 31, 2010 |  |  | 1,847,136 |  |  | $ | 42.37 |  |  |  | 741,505 |  |  | $ | 42.16 |
2011 Activity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  | 347,084 |  |  |  | 57.00 |
Exercised/Vested |  |  | (504,838 | ) |  |  | 42.59 |  |  |  | (243,874 | ) |  |  | 47.19 |
Forfeited |  |  | (2,762 | ) |  |  | 48.02 |  |  |  | (25,961 | ) |  |  | 44.51 |
Net activity |  |  | (507,600 | ) |  |  |  |  |  |  | 77,249 |  |  |  |  |
Total options and nonvested share awards outstanding at December 31, 2011 |  |  | 1,339,536 |  |  | $ | 42.27 |  |  |  | 818,754 |  |  | $ | 46.88 |
Employee Share Purchase Plan Activity |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Shares purchased |  |  | 19,914 |  |  |  | 29,100 |  |  |  | 34,649 |
Weighted average fair value of shares purchased |  | $ | 63.29 |  |  | $ | 50.70 |  |  | $ | 35.68 |
Expense recorded (in millions) |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.4 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number of shares authorized to be purchased, the number of shares purchased at the beginning and end of the period, the number of shares purchased during the period, the weighted-average purchase price of stock purchased under the plan and the weighted average per share fair value of stock purchased under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (g) -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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