Debt - Schedule of Components of Long-term Debt (Details) - USD ($)	Jun. 30, 2017	May 08, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Other debt	$ 21,500,000		$ 16,100,000
Total	641,100,000		300,000,000
Less – current maturities	11,300,000		106,000,000
Total long-term debt	629,800,000		194,000,000
Senior Notes | 10.75% senior notes due April 15, 2022
Debt Instrument [Line Items]
Senior notes	$ 428,500,000		0
Interest rate	10.75%
Face value	$ 440,000,000
Unamortized discount and fees	11,500,000
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Senior notes	$ 182,600,000		179,100,000
Interest rate	5.50%
Face value	$ 213,500,000		213,500,000
Unamortized discount and fees	30,900,000		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	$ 8,500,000		$ 10,100,000