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Bank Debt (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
May 31, 2018
Jun. 30, 2018
May 21, 2018
Debt Instrument [Line Items]      
Debt, interest rate spread on variable rate   4.00%  
Debt instrument, interest rate, effective percentage   6.10%  
Leverage ratio   264.00%  
Debt service coverage ratio   228.00%  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Amount of debt with maximum interest rate   $ 53.0  
Credit Agreement [Member]      
Debt Instrument [Line Items]      
Closing costs of debt   8.7  
Credit agreement, amount outstanding   201.0 $ 267.0
Debt, unused borrowing capacity   61.0  
Liquidity   $ 74.0  
Debt instrument, interest rate, effective percentage   6.00%  
Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt service coverage ratio   125.00%  
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt, interest rate spread on variable rate   3.00%  
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt, interest rate spread on variable rate   4.50%  
Credit Agreement [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Credit agreement, amount outstanding   $ 59.0 120.0
Credit facility, maximum borrowing capacity increase during period $ 6.0    
Debt maturity date   May 21, 2022  
Term Loan [Member] | Credit Agreement [Member]      
Debt Instrument [Line Items]      
Credit agreement, amount outstanding   $ 142.0 $ 147.0