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Share-Based Compensation (Information Pertaining To Option Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Share-Based Compensation    
Weighted average grant-date fair value of stock options granted: $ 1,477,000 $ 2,176,000
Total fair value of stock options vested: 1,015,000 681,000
Total intrinsic value of stock options exercised: 1,459,000 2,467,000
Total pre-tax stock-based compensation expense charged against income: 935,000 465,000
Total unrecognized compensation expense related to non-vested options: $ 4,482,000 $ 3,906,000