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Bank Debt (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2018
May 21, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Debt, interest rate spread on variable rate   4.00%    
Debt instrument, interest rate, effective percentage   6.26%    
Leverage ratio   273.00%    
Debt service coverage ratio   212.00%    
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   8.8    
Deferred financing costs expensed   8.0   $ 3.0
Credit agreement, amount outstanding   200.0 $ 267.0  
Debt, unused borrowing capacity   56.0    
Liquidity   $ 75.0    
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   $ 64.0 120.0  
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   $ 136.0 $ 147.0