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Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

In the following table, revenue is disaggregated by source, commercial terms and method of revenue recognition.

Year ended December 31,		2018				2017
Revenue by source
Construction services		$	42,481			$	21,710
Operations support services		367,580				270,847
		$	410,061			$	292,557
By commercial terms
Time-and-materials		$	151,796			$	97,588
Unit-price		253,277				191,041
Cost-plus		4,988				3,928
		$	410,061			$	292,557
Revenue recognition method
Cost-to-cost percent complete		$	186,741			$	125,716
As-invoiced		223,320				166,841
		$	410,061			$	292,557

b) Customer revenues

Schedule of major customers

At December 31, 2018 and December 31, 2017, the following customers represented 10% or more of accounts receivable and contract assets:

		December 31, 2018			December 31, 2017
Customer 1		33	%		42	%
Customer 2		16	%		20	%
Customer 3		12	%		10	%
Customer 4		7	%		10	%
Customer 5		4	%		12	%

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

Year ended December 31,		2018			2017
Customer A		43	%		44	%
Customer B		23	%		26	%
Customer C		21	%		17	%
Customer D		9	%		11	%

Contract balances

The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:

		December 31, 2018				December 31, 2017
Contract receivables, included in accounts receivable, net		$	78,278			$	45,716
Contract assets		10,673				21,572
Contract liabilities		4,032				824

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

Year ended December 31,		2018				2017
Transferred to receivables from contract assets recognized at the beginning of the period		$	(14,701	)		$	(9,129	)
Increases as a result of changes to the estimate of the stage of completion, excluding amounts transferred in the period		2,043				6,183
Increases as a result of work completed, but not yet an unconditional right to consideration		409				8,554
Increases as a result of Nuna acquisition		1,350				—

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

Year ended December 31,		2018				2017
Revenue recognized that was included in the contract liability balance at the beginning of the period		$	(84	)		$	(347	)
Increases due to cash received, excluding amounts recognized as revenue during the period		1,379				100
Increases as a result of Nuna acquisition		1,913				—

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

Year ended December 31,		2018				2017
Revenue recognized		$	2,516			$	1,177

Estimated revenue expected to be recognized in the future related to performance obligations

The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period was $206,900 for 2019. Included is all consideration from contracts with customers, excluding amounts that are recognized using the as-invoiced method and any constrained amounts of revenue.

Summary of contract costs

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

		December 31, 2018				December 31, 2017
Reimbursable bid costs		$	670			$	422
Fulfillment costs		1,638				—
		$	2,308			$	422

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