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Summary Of Significant Accounting Policies (Schedule Of Calculation Of Basic And Diluted 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, 2009
Sep. 30, 2009
Jun. 30, 2009
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]                              
Net income $ 2,878 $ 19,867 $ 14,701 $ 14,513 $ 19,010 $ 22,469 $ 20,137 $ 18,142 $ 16,505 $ 16,137 $ 11,501 $ 9,238 $ 51,959 $ 79,758 $ 53,381
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period                         59,284 62,141 64,758
Incremental common shares attributable to exercise of outstanding dilutive options                         270 455 303
Incremental common shares attributable to outstanding restricted shares, restricted stock units and phantom stock                         219 96 45
Incremental common shares attributable to exercise of warrants                             10
Denominator for diluted earnings per share                         59,773 62,692 65,116
Basic earnings per share $ 0.05 $ 0.34 $ 0.24 $ 0.24 $ 0.31 $ 0.36 $ 0.32 $ 0.29 $ 0.26 $ 0.25 $ 0.18 $ 0.14 $ 0.88 $ 1.28 $ 0.82
Diluted earnings per share $ 0.05 $ 0.34 $ 0.24 $ 0.24 $ 0.31 $ 0.36 $ 0.32 $ 0.28 $ 0.25 $ 0.25 $ 0.18 $ 0.14 $ 0.87 $ 1.27 $ 0.82