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Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

Year ended December 31,		2019				2018
Revenue by source
Construction services		$	132,310			$	42,481
Operations support services		586,757				367,580
		$	719,067			$	410,061
By commercial terms
Time-and-materials		$	343,156			$	151,796
Unit-price		375,911				253,277
Cost-plus		—				4,988
		$	719,067			$	410,061
Revenue recognition method
Cost-to-cost percent complete		$	252,054			$	186,741
As-invoiced		467,013				223,320
		$	719,067			$	410,061

Schedule of major customers

At December 31, 2019 and December 31, 2018, the following customers represented 10% or more of accounts receivable and contract assets:

		December 31, 2019			December 31, 2018
Customer 1		36	%		16	%
Customer 2		25	%		8	%
Customer 3		13	%		33	%
Customer 4		12	%		12	%

The following customers accounted for 10% or more of total revenues:

Year ended December 31,		2019			2018
Customer A		33	%		43	%
Customer B		27	%		2	%
Customer C		22	%		23	%
Customer D		13	%		21	%

Contract balances

		December 31, 2019				December 31, 2018
Contract assets		$	19,193			$	10,673
Contract liabilities		23				4,032

The following table provides information about significant changes in the contract assets:

Year ended December 31,		2019				2018
Balance, beginning of period		$	10,673			$	21,572
Transferred to receivables from contract assets recognized at the beginning of the period		(10,276		)		(14,701		)
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period		14,892				2,043
Increases as a result of work completed, but not yet an unconditional right to consideration		5,736				409
Increases as a result of Nuna acquisition		—				1,350
Decreases due to effect of change in presentation of NL Partnership		(1,832		)		—
Balance, end of period		$	19,193			$	10,673

The following table provides information about significant changes in the contract liabilities:

Year ended December 31,		2019				2018
Balance, beginning of period		$	4,032			$	824
Revenue recognized that was included in the contract liability balance at the beginning of the period		(4,031		)		(84		)
Increases due to cash received, excluding amounts recognized as revenue during the period		174				1,379
Increases as a result of Nuna acquisition		—				1,913
Decreases due to effect of change in presentation of NL Partnership		(152		)		—
Balance, end of period		$	23			$	4,032

The following table provides information about revenue recognized from performance obligations that were satisfied (or partially satisfied) in previous periods:

Year ended December 31,		2019				2018
Revenue recognized		$	1,857			$	2,516

Schedule remaining performance obligations

For the year ended December 31,
2020	$	58,966
2021	4,729
2022	4,729
2023	4,729
2024	2,225
	$	75,378

Summary of contract costs

The following table summarizes contract costs included within other assets on the consolidated balance sheets.

		December 31, 2019				December 31, 2018
Reimbursable bid costs		$	—			$	670
Fulfillment costs		1,016				1,638
		$	1,016			$	2,308

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Tabular disclosure of cost capitalized in obtaining or fulfilling contract with customer.

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