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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 11,366	$ 11,530	$ 19,982	$ 14,322	$ 22,896	$ 34,303
Denominator:
Weighted-average shares, basic (in shares)	25,274,000		25,640,000		25,407,000	25,619,000
Dilutive effect of share-based payments (in shares)	84,000		110,000		81,000	133,000
Weighted-average shares, diluted (in shares)	25,358,000		25,750,000		25,488,000	25,752,000
Net income per common share, basic (in dollars per share)	$ 0.45		$ 0.78		$ 0.90	$ 1.34
Net income per common share, diluted (in dollars per share)	$ 0.45		$ 0.78		$ 0.90	$ 1.33
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	975,907		573,475		961,980	433,993

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