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Revolving Credit Facility (Details) - USD ($)
6 Months Ended
Nov. 06, 2018
Aug. 25, 2017
Dec. 31, 2018
Oct. 18, 2018
Jun. 30, 2018
Line of Credit Facility          
Long-term borrowings under revolving credit facility     $ 130,000,000   $ 0
Revolving Credit Facility          
Line of Credit Facility          
Line of credit, current borrowing capacity     $ 150,000,000    
Debt, weighted average interest rate     3.94%    
Letter of Credit          
Line of Credit Facility          
Long-term borrowings under revolving credit facility     $ 2,000,000    
Amended Credit Agreement [Member] | Revolving Credit Facility          
Line of Credit Facility          
Line of credit, commitment fee percent   0.25%      
JP Morgan and SunTrust | Amended Credit Agreement [Member] | Revolving Credit Facility          
Line of Credit Facility          
Line of credit, maximum borrowing capacity     125,000,000 $ 135,000,000  
JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility          
Line of Credit Facility          
Line of Credit Facility, Revolving Loan Commitment, Accordion Feature     $ 10,000,000.0    
JP Morgan Chase | Amended Credit Agreement [Member] | Revolving Credit Facility | Minimum          
Line of Credit Facility          
Line of credit, commitment fee percent 0.20%        
JP Morgan Chase | Amended Credit Agreement [Member] | 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 and SunTrust | Minimum          
Line of Credit Facility          
Line of credit, description of interest rate     PRIME - 0.25%    
Prime Rate | JP Morgan and SunTrust | Maximum          
Line of Credit Facility          
Line of credit, description of interest rate     PRIME + 0.50%    
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 and SunTrust | Minimum          
Line of Credit Facility          
Line of credit, description of interest rate     Adjusted LIBO Rate + 1.25%    
London Interbank Offered Rate (LIBOR) | JP Morgan and SunTrust | Maximum          
Line of Credit Facility          
Line of credit, description of interest rate     Adjusted LIBO Rate + 2.00%    
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%        
Option One [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility          
Line of Credit Facility          
Debt Instrument, Description of Variable Rate Basis     Prime Rate    
Option One [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum          
Line of Credit Facility          
Debt Instrument, Basis Spread on Variable Rate     (0.25%)    
Option One [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum          
Line of Credit Facility          
Debt Instrument, Basis Spread on Variable Rate     0.50%    
Option One [Member] | 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 [Member] | 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 [Member] | 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 [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility          
Line of Credit Facility          
Debt Instrument, Description of Variable Rate Basis     LIBOR Rate    
Option Two [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility | Minimum          
Line of Credit Facility          
Debt Instrument, Basis Spread on Variable Rate     1.25%    
Option Two [Member] | JP Morgan and SunTrust | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum          
Line of Credit Facility          
Debt Instrument, Basis Spread on Variable Rate     2.00%    
Option Two [Member] | 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 [Member] | 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 [Member] | JP Morgan Chase | JPM Chase Loan Agreement | Revolving Credit Facility | Maximum          
Line of Credit Facility          
Debt Instrument, Basis Spread on Variable Rate 1.875%