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Capital Stock (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Non-vested stock option activity and related information      
Options Outstanding Non-Vested Stock Options-Beginning of Year 2,160 2,684 2,240
Weighted-Average Grant Date Fair Value Outstanding Non-Vested Stock Options-Beginning of Year $ 6.36 $ 6.56 $ 10.59
Options Granted 96 733 1,518
Granted Weighted-Average Grant Date Fair Value $ 11.27 $ 8.16 $ 3.74
Options Vested (1,071) (1,084) (974)
Vested Weighted-Average Grant Date Fair Value $ 6.18 $ 7.48 $ 10.88
Options Forfeited (128) (173) (100)
Forfeited Weighted Average Grant Date Fair Value $ 11.47 $ 10.06 $ 11.38
Options Outstanding Non-Vested Stock Options-End of Year 1,057 2,160 2,684
Weighted-Average Grant Date Fair Value Outstanding Non-Vested Stock Options-End of Year $ 6.40 $ 6.36 $ 6.56