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LONG-TERM DEBT (Details)
3 Months Ended 12 Months Ended
Oct. 19, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                
Loss on debt extinguishment   $ (3,788,000) $ 0 $ 0 $ 0 $ 0 $ (3,788,000) $ 0
Long-term debt   0         0  
Interest expense, debt           3,000,000 9,000,000 10,000,000
Amortization of debt issuance costs           1,000,000 2,000,000 $ 3,000,000
Debt issuance costs, net   4,000,000       3,000,000 4,000,000  
Letter of Credit [Member]                
Debt Instrument [Line Items]                
Long-term debt   $ 200,000       $ 200,000 $ 200,000  
Letter of Credit [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Revolving credit sub-facility for swing-line loans and issuances of letters of credit $ 20,000,000.0              
Interest rate increase (in case of default) 2.00%              
Revolving Credit Facility [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Revolving credit sub-facility for swing-line loans and issuances of letters of credit $ 750,000,000              
Term of facility 5 years              
Debt issuance costs, line of credit $ 4,000,000              
Unamortized debt issuance expense 4,000,000              
Loss on debt extinguishment $ (4,000,000)              
Line of credit, covenant compliance, Secured Leverage Ratio 3.50              
Line of credit, covenant compliance, Total Leverage Ratio 4.50              
Federal Funds Rate [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate           0.50%    
London Interbank Offered Rate (LIBOR) [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%              
London Interbank Offered Rate (LIBOR) [Member] | Initial Basis Spread [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.25%              
London Interbank Offered Rate (LIBOR) [Member] | Initial Basis Spread One Month LIBOR [Member] | Letter of Credit [Member] | 2017 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.25%