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Share-Based Compensation Plans (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Weighted average per share fair value $ 7.08
Non Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012, Number of Options 162,883
Outstanding at January 1, 2012, Weighted Average Exercise Price $ 21.27
Outstanding at January 1, 2012, Weighted average grant date fair value $ 6.55
Granted, Number of Options 229,763
Granted, Weighted Average Exercise Price $ 23.78
Weighted average per share fair value $ 7.08
Exercised, , Number of Options 0
Exercised, Weighted Average Exercise Price $ 0.00
Exercised, Weighted Average Grant Date Fair Value $ 0.00
Vested, Number of Options (76,103)
Vested, Weighted Average Exercise Price $ 21.55
Vested, Weighted Average Grant Date Fair Value $ 6.63
Forfeited/expired, Number of Options (1,778)
Forfeited/expired, Weighted Average Exercise Price $ 21.48
Forfeited/expired, Weighted Average Grant Date Fair Value $ 6.62
Outstanding at June 30, 2012, Number of Options 314,765
Outstanding at June 30, 2012, Weighted Average Exercise Price $ 23.03
Outstanding at June 30, 2012, Weighted average grant date fair value $ 6.92
Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012, Number of Options 815,119
Outstanding at January 1, 2012, Weighted Average Exercise Price $ 28.29
Granted, Number of Options 229,763
Granted, Weighted Average Exercise Price $ 23.78
Exercised, , Number of Options (1,003)
Exercised, Weighted Average Exercise Price $ 19.97
Vested, Number of Options 0
Vested, Weighted Average Exercise Price $ 0.00
Forfeited/expired, Number of Options (17,133)
Forfeited/expired, Weighted Average Exercise Price $ 30.46
Outstanding at June 30, 2012, Number of Options 1,026,746
Outstanding at June 30, 2012, Weighted Average Exercise Price $ 27.26
Exercisable/vested at June 30, 2012, Number of Options 711,981
Exercisable/vested at June 30, 2012, Weighted Average Exercise Price $ 29.12