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Basis of Presentation - Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Feb. 28, 2017
Computation of basic and diluted earnings per share          
Net income available to common stockholders $ 20,038 $ 20,986 $ 29,382 $ 41,729  
Weighted average shares outstanding-basic 17,924 18,312 17,988 18,285  
Dilutive effect of equity awards 272 370 278 498  
Dilutive effect of the Notes 0 0 0 0  
Weighted average shares outstanding-diluted 18,196 18,682 18,266 18,783  
Basic earnings per share $ 1.12 $ 1.15 $ 1.63 $ 2.28  
Diluted earnings per share $ 1.10 $ 1.12 $ 1.61 $ 2.22  
Shares excluded from diluted earnings per share due to their anti-dilutive effect 45 94 89 85  
1.25% Convertible Senior Notes Due 2022          
Per Share Computations          
Interest rate (as a percentage) 1.25%   1.25%   1.25%