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Debt - Components of Long-term Debt (Details) - USD ($)
Dec. 31, 2016
Apr. 13, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Other debt $ 16,100,000   $ 24,000,000
Total 300,000,000   244,700,000
Less – current maturities 106,000,000   11,000,000
Total long-term debt 194,000,000   233,700,000 [1]
Senior Notes | 5.50% convertible senior notes due March 1, 2021      
Debt Instrument [Line Items]      
Senior notes $ 179,100,000   0
Senior notes, interest rate 5.50% 5.50%  
Face value $ 213,500,000.0 $ 213,500,000.0  
Unamortized discount and fees 34,400,000.0 $ 33,600,000  
Senior Notes | 6.25% senior notes due August 15, 2017      
Debt Instrument [Line Items]      
Senior notes $ 94,700,000   208,200,000
Senior notes, interest rate 6.25%    
Face value $ 95,000,000.0   210,000,000.0
Unamortized discount and fees 300,000.0   1,800,000.0
Capital Lease Obligations      
Debt Instrument [Line Items]      
Capital leases $ 10,100,000   $ 12,500,000
[1] Changed to conform to the current-year presentation. See Note 5.