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Stock-Based Incentive Plan - Valuation Assumptions (Details) - Restricted Stock, Market-Based - $ / shares
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average fair value of market-based awards granted (in dollars per share) $ 3.50 $ 8.24
Risk-free interest rate 1.87% 2.69%
Expected vesting term in years 1 year 4 months 6 days 2 years 9 months 26 days
Expected volatility 43.70% 41.80%
Dividend yield 6.00% 4.00%