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Long-Term Compensation (Details 2) (RSU and PSA [Member], USD $)
6 Months Ended
Jun. 30, 2012
RSU and PSA [Member]
 
Compensation awards other than options  
Number of Shares, Beginning balance 1,684,713
Granted 1,606,377
Distributed (666,533)
Forfeited/ Expired (42,041)
Number of Shares, Ending balance 2,582,516
Weighted Average Grant-Date Fair Value, Ending balance $ 31.98
Vested, end of period 48,735