Debt - Schedule of Components of Long-term Debt (Details) - USD ($)	Jun. 30, 2020	Apr. 15, 2020	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance leases	$ 4,800,000		$ 5,300,000
Other debt	58,200,000		59,600,000
Total	144,800,000		579,400,000
Less – current maturities	97,500,000		13,500,000
Total long-term debt	47,300,000		$ 565,900,000
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Face value					$ 1,000
Senior Notes | 10.75% senior notes
Debt Instrument [Line Items]
Interest rate		10.75%	10.75%
Face value			$ 440,000,000
Unamortized discount and fees			5,500,000
Senior notes	$ 0		434,500,000
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%				5.50%
Face value	$ 84,200,000		84,200,000		$ 213,500,000
Unamortized discount and fees	2,400,000		4,200,000
Senior notes	$ 81,800,000		$ 80,000,000.0	$ 84,200,000