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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2011
Capital Stock [Abstract] |
Summary of stock option activity and related information |
|  | December 31, 2011 |  |  | December 31, 2010 |  |  | December 31, 2009 |
|  | Options (000’s) # |  |  | Weighted- Average Exercise Price $ |  |  | Options (000’s) # |  |  | Weighted- Average Exercise Price $ |  |  | Options (000’s) # |  |  | Weighted- Average Exercise Price $ |
Outstanding-beginning of year |  |  | 6,123 |  |  |  | 31.54 |  |  |  | 5,983 |  |  |  | 31.46 |  |  |  | 4,813 |  |  |  | 37.22 |
Granted |  |  | 96 |  |  |  | 34.93 |  |  |  | 733 |  |  |  | 24.42 |  |  |  | 1,518 |  |  |  | 11.84 |
Exercised |  |  | (363 | ) |  |  | 16.14 |  |  |  | (380 | ) |  |  | 15.12 |  |  |  | (180 | ) |  |  | 12.21 |
Forfeited / expired |  |  | (143 | ) |  |  | 33.11 |  |  |  | (213 | ) |  |  | 29.00 |  |  |  | (168 | ) |  |  | 35.16 |
Outstanding-end of year |  |  | 5,713 |  |  |  | 32.47 |  |  |  | 6,123 |  |  |  | 31.54 |  |  |  | 5,983 |  |  |  | 31.46 |
Exercisable-end of year |  |  | 4,656 |  |  |  | 35.40 |  |  |  | 3,963 |  |  |  | 36.80 |  |  |  | 3,299 |  |  |  | 36.50 |
Non-vested stock option activity and related information |
|  | December 31, 2011 |  |  | December 31, 2010 |  |  | December 31, 2009 |
|  | Options (000’s) # |  |  | Weighted- Average Grant Date Fair Value $ |  |  | Options (000’s) # |  |  | Weighted- Average Grant Date Fair Value $ |  |  | Options (000’s) # |  |  | Weighted- Average Grant Date Fair Value $ |
Outstanding non-vested stock options- beginning of year |  |  | 2,160 |  |  |  | 6.36 |  |  |  | 2,684 |  |  |  | 6.56 |  |  |  | 2,240 |  |  |  | 10.59 |
Granted |  |  | 96 |  |  |  | 11.27 |  |  |  | 733 |  |  |  | 8.16 |  |  |  | 1,518 |  |  |  | 3.74 |
Vested |  |  | (1,071 | ) |  |  | 6.18 |  |  |  | (1,084 | ) |  |  | 7.48 |  |  |  | (974 | ) |  |  | 10.88 |
Forfeited |  |  | (128 | ) |  |  | 11.47 |  |  |  | (173 | ) |  |  | 10.06 |  |  |  | (100 | ) |  |  | 11.38 |
Outstanding non-vested stock options-end of year |  |  | 1,057 |  |  |  | 6.40 |  |  |  | 2,160 |  |  |  | 6.36 |  |  |  | 2,684 |  |  |  | 6.56 |
Details regarding outstanding and exercisable stock options |
|  | Outstanding Options |  |  | Exercisable Options |
Range of Exercise Prices |  | Options (000’s) # |  |  | Weighted- Average Remaining Life (Years) |  |  | Weighted- Average Exercise Price $ |  |  | Options (000’s) # |  |  | Weighted- Average Remaining Life (Years) |  |  | Weighted- Average Exercise Price $ |
$10.00 – $14.99 |  |  | 1,085 |  |  |  | 7.2 |  |  |  | 11.84 |  |  |  | 599 |  |  |  | 7.2 |  |  |  | 11.84 |
$15.00 – $19.99 |  |  | 439 |  |  |  | 0.8 |  |  |  | 19.57 |  |  |  | 439 |  |  |  | 0.8 |  |  |  | 19.57 |
$20.00 – $29.99 |  |  | 685 |  |  |  | 8.2 |  |  |  | 24.39 |  |  |  | 207 |  |  |  | 8.1 |  |  |  | 24.33 |
$30.00 – $34.99 |  |  | 444 |  |  |  | 3.8 |  |  |  | 33.86 |  |  |  | 351 |  |  |  | 2.3 |  |  |  | 33.58 |
$35.00 – $39.99 |  |  | 753 |  |  |  | 4.3 |  |  |  | 38.98 |  |  |  | 753 |  |  |  | 4.3 |  |  |  | 38.98 |
$40.00 – $44.99 |  |  | 1,276 |  |  |  | 6.2 |  |  |  | 40.41 |  |  |  | 1,276 |  |  |  | 6.2 |  |  |  | 40.41 |
$45.00 – $49.99 |  |  | 352 |  |  |  | 3.2 |  |  |  | 46.80 |  |  |  | 352 |  |  |  | 3.2 |  |  |  | 46.80 |
$50.00 – $59.99 |  |  | 676 |  |  |  | 5.2 |  |  |  | 51.40 |  |  |  | 676 |  |  |  | 5.2 |  |  |  | 51.40 |
$60.00 – $64.99 |  |  | 3 |  |  |  | 5.3 |  |  |  | 60.96 |  |  |  | 3 |  |  |  | 5.3 |  |  |  | 60.96 |
|  |  | 5,713 |  |  |  | 5.5 |  |  |  | 32.47 |  |  |  | 4,656 |  |  |  | 4.9 |  |  |  | 35.40 |

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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 remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -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 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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