Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Revenues

Schedule of disaggregation of revenues

(in thousands)	2020		2019		2018
Oilfield services transferred at a point in time	$	—	$	—	$	—
Oilfield services transferred over time		598,302		1,222,409		1,721,005
Total revenues	$	598,302	$	1,222,409	$	1,721,005

Schedule of contract assets included in accounts receivable

(in thousands)	2020		2019
Unbilled trade receivables	$	29,754	$	52,052