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Debt - Schedule of Components of Long-term Debt (Details) - USD ($)
Sep. 30, 2019
Aug. 06, 2019
Dec. 31, 2018
Dec. 31, 2016
Debt Instrument [Line Items]        
Finance leases $ 5,700,000   $ 5,800,000  
Other debt 58,300,000   20,800,000  
Total 577,000,000.0   652,800,000  
Less – current maturities 13,400,000   10,000,000.0  
Total long-term debt $ 563,600,000   642,800,000  
5.50% convertible senior notes due March 1, 2021        
Debt Instrument [Line Items]        
Face value       $ 1,000
Senior Notes | 10.75% senior notes due April 15, 2022        
Debt Instrument [Line Items]        
Interest rate 10.75%      
Face value $ 440,000,000   440,000,000  
Unamortized discount and fees 6,100,000   8,000,000  
Senior notes $ 433,900,000   432,000,000.0  
Senior Notes | 5.50% convertible senior notes due March 1, 2021        
Debt Instrument [Line Items]        
Interest rate 5.50%     5.50%
Face value $ 84,200,000   213,500,000 $ 213,500,000
Unamortized discount and fees 5,100,000   19,300,000  
Senior notes $ 79,100,000 $ 84,200,000 $ 194,200,000