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Long-Term Debt Senior Credit Facility (Details) - USD ($)
Jun. 23, 2017
Dec. 31, 2017
Jun. 20, 2017
Jan. 13, 2017
Apr. 29, 2015
May 30, 2012
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 300,000,000.0      
Proceeds from Issuance of Debt $ 35,500,000          
Line of Credit Facility, Current Borrowing Capacity       $ 73,000,000    
Line of Credit Facility, Potential Incremental Increases       25,000,000    
Long-term Line of Credit   $ 0        
Letters of Credit Outstanding, Amount   12,800,000        
Line of Credit Facility, Unused Borrowing Capacity       $ 60,200,000    
Interest Rate         8.00% 11.25%
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity   $ 20,000,000        
Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate   1.75%        
Base Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest Rate   1.75%        
Base Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Interest Rate   2.75%        
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate at Period End   2.75%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest Rate   2.75%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Interest Rate   3.75%