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Summary Of Significant Accounting Policies (Schedule Of Common Stock And 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
Summary Of Significant Accounting Policies [Abstract]                      
Net income $ 29,368 $ 29,578 $ 27,518 $ 16,293 $ 24,115 $ 24,158 $ 20,930 $ 10,836 $ 102,757 $ 80,039 $ 56,584
Weighted average common shares outstanding                 72,787 72,369 71,672
Dilutive effect of stock-based awards                 438 438 403
Shares used in computing diluted earnings per share                 73,225 72,807 72,075
Basic earnings per share $ 0.40 $ 0.41 $ 0.38 $ 0.22 $ 0.33 $ 0.33 $ 0.29 $ 0.15 $ 1.41 $ 1.11 $ 0.79
Diluted earnings per share $ 0.40 $ 0.40 $ 0.38 $ 0.22 $ 0.33 $ 0.33 $ 0.29 $ 0.15 $ 1.40 $ 1.10 $ 0.79