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Debt - Schedule of Components of Long-term Debt (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2016
Debt Instrument [Line Items]      
Finance leases $ 5,400,000 $ 5,800,000  
Other debt 39,200,000 20,800,000  
Total 676,100,000 652,800,000  
Less – current maturities 7,500,000 10,000,000  
Total long-term debt $ 668,600,000 642,800,000  
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 6,800,000 8,000,000  
Senior notes $ 433,200,000 432,000,000  
Senior Notes | 5.50% convertible senior notes due March 1, 2021      
Debt Instrument [Line Items]      
Interest rate 5.50%   5.50%
Face value $ 213,500,000 213,500,000 $ 213,500,000
Unamortized discount and fees 15,200,000 19,300,000  
Senior notes $ 198,300,000 $ 194,200,000