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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 15 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Adjustments for New Accounting Pronouncement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefit from stock-based payment arrangements   $ 200,000   $ 1,400,000  
Other Tax Expense (Benefit) $ 0   $ 100,000    
Stock Option Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period options are excercisable     10 years    
Shares available for future grants 0   0   0
New Long-Term Management Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares approved to be issued under plan 700,000   700,000   700,000
Shares issued     92,508    
Compensation cost $ 200,000 $ 300,000 $ 200,000 700,000  
New Long-Term Management Incentive Compensation Plan [Member] | 2016-2018 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost     $ 1,000,000    
New Omnibus Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares approved to be issued under plan 700,000   700,000   700,000
Compensation cost     $ 200,000 $ 300,000 $ 0
Period options are excercisable     10 years    
Options issued under stock option plans     21,439 24,317  
Shares available for future grants 509,667   509,667   509,667
New Omnibus Stock Plan [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued 2,176 1,729 5,740 5,290  
Compensation cost $ 100,000 $ 100,000 $ 300,000 $ 300,000