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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2011
Common Stock [Abstract] |
Schedule Of Information Related To Stock Repurchase Programs |
|  | Additional Shares Authorized For Repurchase |  |  | Total number of shares purchased(a) |  |  | Average price paid per share for forfeited restricted shares |  |  | Total number of shares purchased as part of publicly announced programs |  |  | Average price paid per share for shares purchased as part of publicly announced program |  |  | Aggregate purchase price paid (in thousands) |  |  | Maximum number of shares that may yet be purchased under the program |
Balance as of January 1, 2009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,713,548 |
2009 |  |  | — |  |  |  | 2,574,209 |  |  | $ | 0.01 |  |  |  | 2,561,209 |  |  | $ | 24.71 |  |  | $ | 63,288 |  |  |  | 2,152,339 |
2010 |  |  | — |  |  |  | 301,933 |  |  | $ | 0.01 |  |  |  | 293,933 |  |  | $ | 39.22 |  |  | $ | 11,528 |  |  |  | 1,858,406 |
2011 |  |  | — |  |  |  | 1,602,286 |  |  | $ | 0.01 |  |  |  | 1,602,286 |  |  | $ | 37.75 |  |  | $ | 60,482 |  |  |  | 256,120 |
Total for three year period ended December 31, 2011 |  |  | — |  |  |  | 4,478,428 |  |  | $ | 0.01 |  |  |  | 4,457,428 |  |  | $ | 30.35 |  |  | $ | 135,298 |  |  |  |  |
(a) | During 2010 and 2009, there were 8,000 and 13,000, respectively, of restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan which are included in the total number of shares purchased. No such forfeitures occurred during 2011.
Schedule Of Weighted-Average Assumptions Fair Value Of Option Grants |
Year Ended December 31, |  | 2011 |  |  | 2010 |  |  | 2009 |
Volatility |  |  | 29 | % |  |  | 27 | % |  |  | 28 | %
Interest rate |  |  | 2 | % |  |  | 3 | % |  |  | 3 | %
Expected life (years) |  |  | 3.5 |  |  |  | 3.6 |  |  |  | 3.6 |
Forfeiture rate |  |  | 9 | % |  |  | 10 | % |  |  | 10 | %
Dividend yield |  |  | 0.7 | % |  |  | 0.7 | % |  |  | 0.7 | %
Schedule Of Stock Option Activity |
Outstanding Options |  | Number of Shares |  |  | Average Option Price |  |  | Range (High-Low) |
Balance, January 1, 2009 |  |  | 8,116,326 |  |  | $ | 22.68 |  |  | $ | 31.70 -$16.22 |
Granted |  |  | 2,635,000 |  |  | $ | 31.18 |  |  | $ | 31.18 -$31.18 |
Exercised |  |  | (1,582,376 | ) |  | $ | 23.71 |  |  | $ | 29.89 -$16.22 |
Cancelled |  |  | (366,500 | ) |  | $ | 22.84 |  |  | $ | 29.89 -$16.22 |
Balance, January 1, 2010 |  |  | 8,802,450 |  |  | $ | 25.03 |  |  | $ | 31.70 -$16.22 |
Granted |  |  | 94,000 |  |  | $ | 30.40 |  |  | $ | 32.28 -$30.32 |
Exercised |  |  | (2,000,250 | ) |  | $ | 24.87 |  |  | $ | 31.70 -$16.22 |
Cancelled |  |  | (301,250 | ) |  | $ | 24.91 |  |  | $ | 31.18 -$16.22 |
Balance, January 1, 2011 |  |  | 6,594,950 |  |  | $ | 25.16 |  |  | $ | 32.28 -$16.22 |
Granted |  |  | 2,894,500 |  |  | $ | 43.66 |  |  | $ | 54.79 -$38.12 |
Exercised |  |  | (1,563,255 | ) |  | $ | 26.38 |  |  | $ | 32.28 -$16.22 |
Cancelled |  |  | (367,250 | ) |  | $ | 32.60 |  |  | $ | 46.97 -$16.22 |
Balance, December 31, 2011 |  |  | 7,558,945 |  |  | $ | 31.63 |  |  | $ | 54.79 -$16.22 |
Outstanding options vested and exercisable as of December 31, 2011 |  |  | 2,979,945 |  |  | $ | 23.82 |  |  | $ | 31.18 -$16.22 |
Schedule Of Information About Unvested Options |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested options as of January 1, 2011 |  |  | 3,799,250 |  |  | $ | 5.80 |
Granted |  |  | 2,894,500 |  |  | $ | 11.62 |
Vested |  |  | (1,757,500 | ) |  | $ | 5.26 |
Cancelled |  |  | (357,250 | ) |  | $ | 8.19 |
Unvested options as of December 31, 2011 |  |  | 4,579,000 |  |  | $ | 9.50 |
Schedule Of Information About All Outstanding Options And Exercisable Options |
|  | Options Outstanding |  |  | Options Exercisable |
Number |  |  | 7,558,945 |  |  |  | 2,979,945 |
Weighted average exercise price |  | $ | 31.63 |  |  | $ | 23.82 |
Aggregate intrinsic value as of December 31, 2011 |  | $ | 67,870,455 |  |  | $ | 44,833,019 |
Weighted average remaining contractual life |  |  | 2.8 |  |  |  | 1.8 |
Schedule Of Weighted Average Remaining Contractual Life For Options Outstanding And Weighted Average Exercise Price Per Share For Exercisable Options |
|  | Options Outstanding |  |  | Exercisable Options |  |  | Expected to Vest Options(a) |
Exercise Price |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Shares |  |  | Weighted Average Exercise Price Per Share |
$16.22 – $24.45 |  |  | 2,642,825 |  |  | $ | 19.56 |  |  |  | 1.5 |  |  |  | 2,050,825 |  |  | $ | 20.53 |  |  |  | 537,891 |  |  | $ | 16.22 |
$25.32 – $29.26 |  |  | 29,500 |  |  |  | 26.80 |  |  |  | 1.1 |  |  |  | 17,750 |  |  |  | 26.59 |  |  |  | 10,676 |  |  |  | 27.12 |
$29.60 – $32.28 |  |  | 2,139,120 |  |  |  | 31.15 |  |  |  | 2.9 |  |  |  | 911,370 |  |  |  | 31.16 |  |  |  | 1,115,534 |  |  |  | 31.14 |
$38.12 – $43.67 |  |  | 2,728,000 |  |  |  | 43.59 |  |  |  | 4.1 |  |  |  | — |  |  |  | N/A |  |  |  | 2,478,661 |  |  |  | 43.59 |
$46.79 – $54.79 |  |  | 19,500 |  |  |  | 52.99 |  |  |  | 4.3 |  |  |  | — |  |  |  | N/A |  |  |  | 17,718 |  |  |  | 52.99 |
Total |  |  | 7,558,945 |  |  | $ | 31.63 |  |  |  | 2.8 |  |  |  | 2,979,945 |  |  | $ | 23.82 |  |  |  | 4,160,480 |  |  | $ | 36.71 |
(a) | Assumes a weighted average forfeiture rate of 9.14%.

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