Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenues

Schedule of disaggregation of revenues

(in thousands)	2019		2018		2017
Oilfield services transferred at a point in time	$	—	$	—	$	—
Oilfield services transferred over time		1,222,409		1,721,005		1,595,227
Total revenues	$	1,222,409	$	1,721,005	$	1,595,227

Schedule of contract assets included in accounts receivable

(in thousands)	2019		2018
Unbilled trade receivables	$	52,052	$	56,408