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Share-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Summary of the activity related to stock options granted under the Company's Incentive Plan      
Total Shares outstanding, beginning balance 4,026 3,350 3,247
Total Shares, granted 1,250 922 218
Total Shares, exercised (140) (144) (102)
Total Shares, forfeited, canceled or expired (172) (102) (13)
Total Shares outstanding, ending balance 4,964 4,026 3,350
Weighted Average Exercise Price per Share Outstanding, beginning balance $ 14.24 $ 12.30 $ 12.00
Weighted Average Exercise Price per Share, granted $ 15.34 $ 21.29 $ 16.65
Weighted Average Exercise Price per Share, exercised $ 12.00 $ 12.12 $ 12.00
Weighted Average Exercise Price per Share, forfeited, canceled or expired $ 17.29 $ 17.45 $ 12.00
Weighted Average Exercise Price per Share Outstanding, ending balance $ 14.47 $ 14.24 $ 12.30
Weighted Average Exercise Price per Share, exercisable $ 12.90    
Weighted Average Remaining Contractual Term (Years), Outstanding 7.67    
Weighted Average Remaining Contractual Term (Years), Exercisable 7.01    
Aggregate Intrinsic Value, Outstanding $ 7,396    
Aggregate Intrinsic Value, Exercisable $ 6,403    
Total Shares, exercisable 2,092    
Total Shares, available for issuance 2,094