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Earnings Per Share (Reconciliation Of Earnings Per Share) (Details) (USD $)
In Thousands, except Per 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]                      
Net income for basic and diluted earnings per share $ 17,014 $ 16,276 $ 14,390 $ 10,498 $ 12,509 $ 12,617 $ 9,630 $ 8,702 $ 58,178 $ 43,458 $ 34,265
Weighted average shares outstanding - basic                 36,913 37,223 37,367
Dilutive effect of stock options and restricted stock                 150 162 158
Weighted average shares outstanding - diluted                 37,063 37,385 37,525
Earnings per share - basic $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 0.34 $ 0.34 $ 0.26 $ 0.23 $ 1.58 $ 1.17 $ 0.92
Earnings per share - diluted $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 0.34 $ 0.34 $ 0.26 $ 0.23 $ 1.57 $ 1.16 $ 0.91