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Debt Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 06, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Mar. 27, 2019
Line of Credit Facility              
Long-term borrowings under revolving credit facility   $ 70,000,000   $ 70,000,000   $ 92,000,000  
Revolving Credit Facility              
Line of Credit Facility              
Long-term borrowings under revolving credit facility   $ 70,000,000   $ 70,000,000   $ 92,000,000  
Debt, weighted average interest rate   4.05%   4.05%   3.98%  
JP Morgan Chase | Amended Credit Agreement | Revolving Credit Facility | Minimum              
Line of Credit Facility              
Line of credit, commitment fee percent 0.20%            
JP Morgan Chase | Amended Credit Agreement | Revolving Credit Facility | Maximum              
Line of Credit Facility              
Line of credit, commitment fee percent 0.40%            
JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility              
Line of Credit Facility              
Line of credit, maximum borrowing capacity $ 150,000,000            
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature 75,000,000            
JP Morgan Chase | JPM Chase Loan Agreement | Swing Line Loans              
Line of Credit Facility              
Line of credit, maximum borrowing capacity $ 15,000,000            
Prime Rate | JP Morgan Chase | Minimum              
Line of Credit Facility              
Line of credit, description of interest rate PRIME + 0.25%            
Prime Rate | JP Morgan Chase | Maximum              
Line of Credit Facility              
Line of credit, description of interest rate PRIME + 0.875%            
London Interbank Offered Rate (LIBOR) | JP Morgan Chase | Minimum              
Line of Credit Facility              
Line of credit, description of interest rate Adjusted LIBO Rate + 1.25%            
London Interbank Offered Rate (LIBOR) | JP Morgan Chase | Maximum              
Line of Credit Facility              
Line of credit, description of interest rate Adjusted LIBO Rate + 1.875%            
Interest Rate Swap              
Line of Credit Facility              
Derivative, Notional Amount   $ 65,000,000   $ 65,000,000     $ 80,000,000
Interest Rate Swap | Interest Expense              
Line of Credit Facility              
Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax   $ (407,000) $ 0 $ (407,000) $ 0    
Option One | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility              
Line of Credit Facility              
Debt Instrument, Description of Variable Rate Basis Prime Rate            
Option One | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum              
Line of Credit Facility              
Debt Instrument, Basis Spread on Variable Rate 0.25%            
Option One | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum              
Line of Credit Facility              
Debt Instrument, Basis Spread on Variable Rate 0.875%            
Option Two | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility              
Line of Credit Facility              
Debt Instrument, Description of Variable Rate Basis LIBOR Rate            
Option Two | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum              
Line of Credit Facility              
Debt Instrument, Basis Spread on Variable Rate 1.25%            
Option Two | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum              
Line of Credit Facility              
Debt Instrument, Basis Spread on Variable Rate 1.875%