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Earnings Per Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share                      
Income from continuing operations $ 16,904 $ 16,525 $ 23,841 $ 15,490 $ 15,583 $ 15,963 $ 15,868 $ 14,425 $ 72,760 $ 61,840 $ 57,061
Discontinued operations 1,210 2,283 1,276 3,603 1,371 1,371 3,321 1,519 8,372 7,581 7,168
Net income available to common stockholders $ 18,114 $ 18,808 $ 25,117 $ 19,093 $ 16,954 $ 17,334 $ 19,189 $ 15,944 $ 81,132 $ 69,421 $ 64,229
Weighted average common shares outstanding, basic 27,741,961 27,729,560 27,708,136 27,696,727 27,686,217 27,673,703 27,665,629 27,632,376 27,719,096 27,664,482 27,586,338
Income from continuing operations per common share, basic $ 0.61 $ 0.60 $ 0.86 $ 0.56 $ 0.56 $ 0.57 $ 0.57 $ 0.52 $ 2.63 $ 2.24 $ 2.07
Discontinued operations per common share, basic $ 0.04 $ 0.08 $ 0.05 $ 0.13 $ 0.05 $ 0.05 $ 0.12 $ 0.06 $ 0.30 $ 0.27 $ 0.26
Net income per common share $ 0.65 $ 0.68 $ 0.91 $ 0.69 $ 0.61 $ 0.62 $ 0.69 $ 0.58 $ 2.93 $ 2.51 $ 2.33
Weighted average common shares outstanding, diluted                 27,719,096 27,664,482 27,586,338
Stock options, diluted                 72,035 65,548 28,825
Restricted shares, diluted                 1,461 2,929 3,137
Average dilutive common shares outstanding 27,784,915 27,789,725 27,799,616 27,796,109 27,783,517 27,737,802 27,729,034 27,681,479 27,792,592 27,732,959 27,618,300
Income from continuing operations per common share $ 0.61 $ 0.60 $ 0.85 $ 0.56 $ 0.56 $ 0.57 $ 0.57 $ 0.52 $ 2.62 $ 2.23 $ 2.06
Discontinued operations per common share $ 0.04 $ 0.08 $ 0.05 $ 0.13 $ 0.05 $ 0.05 $ 0.12 $ 0.06 $ 0.30 $ 0.27 $ 0.26
Net income per common share $ 0.65 $ 0.68 $ 0.90 $ 0.69 $ 0.61 $ 0.62 $ 0.69 $ 0.58 $ 2.92 $ 2.50 $ 2.32
Stock options with an exercise price in excess of the market price for our common shares                 16,758 1,297 9,906