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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 15 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
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   $ 1,200,000  
Other Tax Expense (Benefit) $ 100,000   $ 200,000    
Stock Option Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued     0 0  
Compensation cost     $ 0 $ 0  
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 $ 0 $ 200,000 $ 0 400,000  
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 Long-Term Management Incentive Compensation Plan [Member] | 2017-2019 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost     900,000    
New Long-Term Management Incentive Compensation Plan [Member] | 2018-2020 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost     $ 800,000    
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 511,843   511,843   511,843
New Omnibus Stock Plan [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued 1,701 1,783 3,564 3,561  
Compensation cost $ 100,000 $ 100,000 $ 200,000 $ 200,000