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Debt - Schedule of Components of Long-term Debt (Details) - USD ($)
Sep. 30, 2017
May 08, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Other debt $ 21,600,000   $ 16,100,000
Total 642,800,000   300,000,000
Less – current maturities 11,300,000   106,000,000
Total long-term debt 631,500,000   194,000,000
Senior Notes | 10.75% senior notes due April 15, 2022      
Debt Instrument [Line Items]      
Senior notes $ 429,000,000   0
Interest rate 10.75%    
Face value $ 440,000,000    
Unamortized discount and fees 11,000,000    
Senior Notes | 5.50% convertible senior notes due March 1, 2021      
Debt Instrument [Line Items]      
Senior notes $ 184,400,000   179,100,000
Interest rate 5.50%    
Face value $ 213,500,000   213,500,000
Unamortized discount and fees 29,100,000   34,400,000
Senior Notes | 6.25% senior notes      
Debt Instrument [Line Items]      
Senior notes $ 0   94,700,000
Interest rate 6.25% 6.25%  
Capital Lease Obligations      
Debt Instrument [Line Items]      
Capital leases $ 7,800,000   $ 10,100,000