Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Schedule Of Earnings Per Share Reconciliation) (Details)

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Earnings Per Share (Schedule Of Earnings Per Share Reconciliation) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share [Abstract]        
Basic, Net income $ 25,117 $ 27,265 $ 51,986 $ 48,439
Diluted, Net income $ 25,117 $ 27,265 $ 51,986 $ 48,439
Basic, Shares 55,656,274 47,454,359 55,641,241 46,097,207
Effect of dilutive securities, Stock options and restricted stock awards, Shares 677,821 444,306 534,007 451,207
Diluted, Shares 56,334,095 47,898,665 56,175,248 46,548,414
Basic, Net income Per Share $ 0.45 $ 0.57 $ 0.93 $ 1.05
Diluted, Net income Per Share $ 0.45 $ 0.57 $ 0.93 $ 1.04