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Debt - Credit and Security Agreement (Details)
6 Months Ended
Nov. 20, 2017
USD ($)
Jun. 30, 2019
USD ($)
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 90,000,000.0  
Maturity period 5 years  
Potential maximum borrowing capacity, subject to Lender approval $ 115,000,000.0  
Fixed charge coverage ratio 0.50  
Outstanding borrowings   $ 0
Remaining borrowing capacity   $ 64,800,000
Revolving Credit Facility | Federal Funds Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   0.50%
Revolving Credit Facility | LIBOR rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   1.00%
Revolving Credit Facility | Base Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   1.00%
Revolving Credit Facility | Base Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   1.50%
Revolving Credit Facility | Eurodollar Rate | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   2.00%
Revolving Credit Facility | Eurodollar Rate | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate   2.50%
Letter of Credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 50,000,000.0  
Outstanding borrowings   $ 5,700,000
Swing Line Loan    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 10,000,000.0