Acquisitions (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Jan. 31, 2018 USD ($)	Aug. 16, 2017 USD ($) item $ / shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Purchase price allocation
Goodwill			$ 0.0		$ 9.0
ESCO
Acquisitions
Number of well service rigs | item		49
Purchase Price
Cash		$ 47.7
Seller's notes		7.0
Equity issued		5.0
Total purchase price		59.7
Purchase price allocation
Accounts receivable		6.6
Property, plant and equipment		45.9
Intangibles		2.2
Other assets		0.3
Total assets acquired		55.0
Accounts payable		(0.5)
Accrued expenses		(2.2)
Total liabilities assumed		(2.7)
Goodwill		7.4
Allocated purchase price		59.7
Supplemental Pro Form Information
Revenue			62.6	$ 38.2
Operating Loss			(10.8)	(7.5)
Net Loss			(10.3)	$ (8.0)
Revenue of acquiree			$ 9.6
MVCI Energy Services
Purchase Price
Total purchase price	$ 4.0
Class A Common Stock | ESCO
Purchase Price
Equity issued		$ 5.0
Share price (in dollars per share) | $ / shares		$ 14.50