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Incentive Plan - Summary of stock option activity (Details) - Equity Incentive Plans
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Shares:    
Outstanding, Beginning of Period | shares 514,000 529,000
Granted | shares 0 0
Exercised | shares (5,000) (20,000)
Forfeited | shares 0 0
Outstanding, End of Period | shares 509,000 509,000
Vested and expected to vest at December 31, 2018 | shares 506,400 506,400
Exercisable at December 31, 2018 | shares 496,000 496,000
Weighted-Average Exercise Price (in dollars per share):    
Outstanding, Beginning of Period | $ / shares $ 12.84 $ 12.77
Granted | $ / shares 0.00 0.00
Exercised | $ / shares 14.59 11.31
Forfeited | $ / shares 0.00 0.00
Outstanding, End of Period | $ / shares 12.83 12.83
Vested and expected to vest at December 31, 2018 | $ / shares 12.79 12.79
Exercisable at December 31, 2018 | $ / shares $ 12.65 $ 12.65
Weighted- Average Remaining Contractual Term (Years):    
Outstanding at year end 4 years 9 months 18 days 4 years 9 months 18 days
Vested and expected to vest at December 31, 2018 4 years 9 months 11 days 4 years 9 months 11 days
Exercisable at December 31, 2018 4 years 8 months 19 days 4 years 8 months 19 days
Aggregate Intrinsic Value ($000):    
Outstanding at year end | $ $ 1,485 $ 1,485
Vested and expected to vest at December 31, 2018 | $ 1,485 1,485
Exercisable at December 31, 2018 | $ $ 1,485 $ 1,485