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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Net Components of Basic and Diluted Earnings per Share           
Net income$ 36,365$ 26,527$ 31,838$ 27,429$ 27,852$ 19,962$ 23,773$ 25,707$ 122,159$ 97,294$ 68,472
Weighted average outstanding shares of common stock (B)        49,91749,03347,372
Dilutive effect of stock options and restricted stock        452543704
Weighted average common stock and common stock equivalents (C)        50,36949,57648,076
Basic earnings per share (A/B)$ 0.73$ 0.53$ 0.64$ 0.55$ 0.57$ 0.41$ 0.49$ 0.53$ 2.45$ 1.98$ 1.45
Diluted earnings per share (A/C)$ 0.72$ 0.53$ 0.63$ 0.55$ 0.56$ 0.40$ 0.48$ 0.52$ 2.43$ 1.96$ 1.42
Potential common shares excluded from the calculation of diluted earnings per share        215124