Annual report pursuant to Section 13 and 15(d)

Earnings Per Share (Calculation Of Basic And Diluted Net Earnings Per Common Share) (Details)

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Earnings Per Share (Calculation Of Basic And Diluted Net Earnings Per Common 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 [Abstract]                      
Earnings from continuing operations, net of tax $ 30,112 $ 28,987 $ 28,374 $ 23,745 $ 25,464 $ 22,402 $ 22,999 $ 20,082 $ 111,218 $ 90,947 $ 86,093
Discontinued operations, net of tax         (65) 260 (226) 3,920   3,889 (2,422)
Net earnings $ 30,112 $ 28,987 $ 28,374 $ 23,745 $ 25,399 $ 22,662 $ 22,773 $ 24,002 $ 111,218 $ 94,836 $ 83,671
Weighted average number of common shares outstanding                 50,198,954 48,754,947 43,034,791
Common stock equivalents (as determined by applying the treasury stock method)                 2,275,284 1,692,941 1,281,676
Weighted average number of common shares and potential dilutive common shares outstanding                 52,474,238 50,447,888 44,316,467
Continuing operations, Basic $ 0.60 $ 0.58 $ 0.57 $ 0.48 $ 0.52 $ 0.46 $ 0.46 $ 0.43 $ 2.22 $ 1.87 $ 2.00
Discontinued operations, Basic               $ 0.08   $ 0.08 $ (0.06)
Earnings per common share, Basic $ 0.60 $ 0.58 $ 0.57 $ 0.48 $ 0.52 $ 0.46 $ 0.46 $ 0.51 $ 2.22 $ 1.95 $ 1.94
Continuing operations, Diluted $ 0.57 $ 0.55 $ 0.54 $ 0.46 $ 0.50 $ 0.44 $ 0.45 $ 0.41 $ 2.12 $ 1.80 $ 1.94
Discontinued operations, Diluted               $ 0.08   $ 0.08 $ (0.05)
Earnings per common share, Diluted $ 0.57 $ 0.55 $ 0.54 $ 0.46 $ 0.50 $ 0.44 $ 0.45 $ 0.49 $ 2.12 $ 1.88 $ 1.89
Anti-dilutive stock options, restricted stock and restricted stock units excluded from the calculation of diluted earnings per common share                 106,219 2,010,183 2,351,679