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Capital Stock (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of stock option activity and related information      
Options Outstanding-Beginning of year 6,123 5,983 4,813
Weighted-Average Grant Date Fair Value Outstanding-Beginning of year $ 31.54 $ 31.46 $ 37.22
Options Granted 96 733 1,518
Weighted-Average Exercise Price Granted $ 34.93 $ 24.42 $ 11.84
Options Exercised (363) (380) (180)
Weighted-Average Exercise Price Exercised $ 16.14 $ 15.12 $ 12.21
Options Forfeited and Expired (143) (213) (168)
Weighted-Average Exercise Price Forfeited and Expired $ 33.11 $ 29.00 $ 35.16
Options Outstanding-End of year 5,713 6,123 5,983
Weighted-Average Grant Date Fair Value Outstanding-End of year $ 32.47 $ 31.54 $ 31.46
Options Exercisable-End of year 4,656 3,963 3,299
Weighted-Average Grant Date Fair Value Exercisable-End of year $ 35.40 $ 36.80 $ 36.50