XML 87 R71.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Components of Long-term Debt (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Long-term debt $ 647,000,000    
Other debt 20,800,000 $ 21,300,000  
Total 652,800,000 644,700,000  
Less – current maturities 10,000,000 10,800,000  
Total long-term debt $ 642,800,000 633,900,000  
5.50% convertible senior notes due March 1, 2021      
Debt Instrument [Line Items]      
Face value     $ 1,000
Senior Notes | 10.75% senior secured notes due April 15, 2022      
Debt Instrument [Line Items]      
Interest rate 10.75%    
Face value $ 440,000,000.0 440,000,000.0  
Unamortized discount and fees 8,000,000.0 10,400,000.0  
Long-term debt $ 432,000,000 429,600,000  
Senior Notes | 5.50% convertible senior notes due March 1, 2021      
Debt Instrument [Line Items]      
Interest rate 5.50%   5.50%
Face value $ 213,500,000.0 213,500,000.0 $ 213,500,000.0
Unamortized discount and fees 19,300,000.0 27,200,000.0  
Long-term debt 194,200,000 186,300,000  
Capital Lease Obligations      
Debt Instrument [Line Items]      
Capital leases $ 5,800,000 $ 7,500,000