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Share-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Summary of the activity related to stock options granted under the Company's Incentive Plan  
Total Shares outstanding, beginning balance 4,964
Total Shares, granted   
Total Shares, exercised (192)
Total Shares, forfeited, canceled or expired (59)
Total Shares outstanding, ending balance 4,713
Total Shares, exercisable 2,273
Total Shares, available for issuance 2,728
Weighted Average Exercise Price per Share Outstanding, beginning balance $ 14.47
Weighted Average Exercise Price per Share, granted   
Weighted Average Exercise Price per Share, exercised $ 12.04
Weighted Average Exercise Price per Share, forfeited, canceled or expired $ 17.17
Weighted Average Exercise Price per Share Outstanding, ending balance $ 14.54
Weighted Average Exercise Price per Share, exercisable $ 13.72
Weighted Average Remaining Contractual Term (Years), Outstanding 7.44
Weighted Average Remaining Contractual Term (Years), Exercisable 7.06
Aggregate Intrinsic Value, Outstanding $ 15,177
Aggregate Intrinsic Value, Exercisable $ 9,185