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Long-Term Compensation (Details 3) (USD $)
12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Restricted Stock [Member]
Non-vested stock options    
Number of Options, Beginning balance   1,863,420
Weighted Average Grant-Date Fair Value, Beginning balance   $ 31.00
Number of Options, AMB awards   89,864
Weighted Average Grant-Date Fair Value, AMB awards   $ 34.07
Granted 370,320 1,027,960
Weighted Average Grant-Date Fair Value, Granted   $ 34.13
Number of Options, Settled   (149,053)
Weighted Average Grant-Date Fair Value, Settled   $ 58.51
Number of Options, Distributed   976,185
Weighted Average Grant-Date Fair Value, Distributed   $ 29.66
Number of Options, Forfeited   171,293
Weighted Average Grant-Date Fair Value, Forfeited   $ 58.29
Number of Options, Ending balance   1,684,713
Weighted Average Grant-Date Fair Value, Ending balance   $ 30.43
Vested, beginning balance   87,935
Vested, end of period   48,735