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Share-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 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 (273)
Total Shares, forfeited, Cancelled or expired (80)
Total Shares outstanding, ending balance 4,611
Total Shares, exercisable 2,208
Total Shares, available for issuance 2,721
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 $ 12.57
Weighted Average Exercise Price per Share, forfeited, Cancelled or expired $ 17.62
Weighted Average Exercise Price per Share Outstanding, ending balance $ 14.53
Weighted Average Exercise Price per Share, exercisable $ 13.74
Weighted Average Remaining Contractual Term (Years), Outstanding 7.19
Weighted Average Remaining Contractual Term (Years), Exercisable 6.80
Aggregate Intrinsic Value, Outstanding $ 29,558
Aggregate Intrinsic Value, Exercisable $ 15,899