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Debt (Senior Notes) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Aug. 03, 2020
Jul. 30, 2020
Jul. 15, 2020
Jun. 29, 2018
Debt Instrument [Line Items]                
Write-off of Senior Note issuance costs $ 4,420,000 $ 0 $ 4,420,000 $ 0        
Subsequent event                
Debt Instrument [Line Items]                
Debt interest payment, default amount         $ 12,500,000      
8.75% Senior Notes due 2023                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 300,000,000
Debt instrument, interest rate               8.75%
8.75% Senior Notes due 2023 | Subsequent event                
Debt Instrument [Line Items]                
Debt interest payment, default amount             $ 13,125,000  
Initial Consenting Noteholders, percentage of principle amount of outstanding Senior Notes           75.00%