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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income	$ 11,715	$ 19,982	$ 14,322	$ 10,649	$ 7,969	$ 4,147	$ 46,019	$ 22,765
Denominator:
Weighted-average shares, basic (in shares)	25,704,000			25,572,000			25,647,000	25,503,000
Dilutive effect of share-based payments (in shares)	58,000			34,000			108,000	104,000
Weighted-average shares, diluted (in shares)	25,762,000			25,606,000			25,755,000	25,607,000
Net income per common share, basic (in dollars per share)	$ 0.46			$ 0.42			$ 1.79	$ 0.89
Net income per common share, diluted (in dollars per share)	$ 0.45			$ 0.42			$ 1.79	$ 0.89
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	592,411			952,351			459,189	534,082

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