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LONG-TERM DEBT (Details - Covenant Calculations)
3 Months Ended 12 Months Ended
Oct. 19, 2017
USD ($)
Apr. 03, 2014
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 01, 2014
Debt Instrument [Line Items]                    
Loss on extinguishment of debt     $ 3,788,000 $ 0 $ 0 $ 0 $ 3,788,000 $ 0 $ 0  
Maximum first lien secured leverage ratio after eight quarters after closing date                   350.00%
Maximum total leverage ratio after eight fiscal quarters                   450.00%
London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   2.00%                
Revolving Credit Facility [Member] | 2017 Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 750,000,000                  
Term of loan 5 years                  
Debt issuance costs, line of credit $ 4,000,000                  
Unamortized debt issuance expense 5,000,000                  
Loss on extinguishment of debt $ 4,000,000                  
Line of credit, covenant compliance, Secured Leverage Ratio 3.50                  
Line of credit, covenant compliance, Total Leverage Ratio 4.50                  
Letter of Credit [Member] | 2017 Credit Agreement [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 20,000,000.0                  
Interest rate increase (in case of default) 2.00%                  
Letter of Credit [Member] | 2017 Credit Agreement [Member] | Federal Funds Effective Swap Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 0.50%                  
Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.00%                  
Initial Basis Spread [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.25%                  
Initial Basis Spread One Month LIBOR [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 0.25%