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Seasonal Financing - Narrative (Details) - Revolving Credit Facility - Credit Agreement
Dec. 20, 2017
USD ($)
trading_day
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Aggregate commitment under the credit facility $ 1,600,000,000    
Outstanding borrowings   $ 80,000,000 $ 0
Equity interest subject to a lien (as a percent) 100.00%    
Voting stock subject to a lien (as a percent) 65.00%    
Interest coverage ratio minimum for covenant compliance 1.00    
Excess availability under credit facility $ 100,000,000    
Availability threshold (as a percent) 10.00%    
Threshold consecutive trading days | trading_day 30    
Minimum | LIBOR      
Debt Instrument [Line Items]      
Interest rate margin for loans (as a percent) 1.25%    
Minimum | Base Rate      
Debt Instrument [Line Items]      
Interest rate margin for loans (as a percent) 0.25%    
Maximum | LIBOR      
Debt Instrument [Line Items]      
Interest rate margin for loans (as a percent) 3.00%    
Maximum | Base Rate      
Debt Instrument [Line Items]      
Interest rate margin for loans (as a percent) 2.00%