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Debt (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 15, 2016
Dec. 01, 2015
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Outstanding borrowings     $ 350,000,000   $ 350,000,000
Repayment of revolver borrowings     144,000,000 $ 110,987,000  
Senior secured notes, due 2024 [Member]          
Debt Instrument [Line Items]          
Debt issuance date Sep. 15, 2016        
Interest rate 5.50%        
Estimated market value above (below) carrying amount     10,300,000    
Outstanding borrowings $ 350,000,000.0   350,000,000   350,000,000
Revolving credit agreement [Member]          
Debt Instrument [Line Items]          
Date entered into agreement   Dec. 01, 2015      
Maximum borrowing capacity     425,000,000.0    
Outstanding borrowings     0   $ 0
Net availability     362,300,000    
Letters of credit outstanding     $ 61,600,000    
Guarantor Subsidiaries [Member] | Senior secured notes, due 2024 [Member]          
Debt Instrument [Line Items]          
Ownership percent 100.00%        
BMC East, LLC [Member] | Senior secured notes, due 2024 [Member]          
Debt Instrument [Line Items]          
Ownership percent 100.00%