Revenue

Remaining Performance Obligations

The Company had $882.4 million of remaining performance obligations yet to be satisfied as of December 31, 2018. The Company expects to recognize $739.0 million of its remaining performance obligations as revenue within the next twelve months.

Contract Balances

Contracts terms with customers include the timing of billing and payment, which usually differs from the timing of revenue recognition. As a result, we carry contract assets and liabilities in our balance sheet. These contract assets and liabilities are calculated on a contract-by-contract basis and reported on a net basis at the end of each period and are classified as current. We present our contract assets in the balance sheet as Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts ("CIE"). CIE consists of revenue recognized in excess of billings. We present our contract liabilities on the balance sheet as Billings on Uncompleted Contracts in Excess of Costs and Estimated Earnings ("BIE"). BIE consists of advance payments and billings in excess of revenue recognized. The following table provides information about CIE and BIE:



	December 31, 2018			June 30, 2018			Change
	(in thousands)
Costs and estimated earnings in excess of billings on uncompleted contracts	$	72,694		$	76,632		$	(3,938	)
Billings on uncompleted contracts in excess of costs and estimated earnings	(115,366		)	(120,740		)	5,374
Net contract liabilities	$	(42,672	)	$	(44,108	)	$	1,436

The difference between the beginning and ending balances of the Company's CIE and BIE primarily results from the timing of the Company's performance and its billings. The amount of revenue recognized during the six months ended December 31, 2018 that was included in the prior period BIE balance was $94.8 million. This revenue consists primarily of work performed during the period on contracts with customers that had advance billings.

Gross amounts of contact assets and liabilities on uncompleted contracts are as follows:



	December 31, 2018			June 30, 2018
	(in thousands)
Costs incurred and estimated earnings recognized on uncompleted contracts	$	2,089,319		$	2,081,799
Billings on uncompleted contracts	2,131,991			2,125,907
Net contract liabilities	$	(42,672	)	$	(44,108	)

Progress billings in accounts receivable at December 31, 2018 and June 30, 2018 included retentions to be collected within one year of $21.3 million and $25.9 million, respectively. Contract retentions collectible beyond one year are included in other assets in the Condensed Consolidated Balance Sheet and totaled $11.7 million as of December 31, 2018 and $2.6 million as of June 30, 2018.

Disaggregated Revenue

Revenue disaggregated by reportable segment is presented in Note 9 - Segment Information. The following table presents revenue disaggregated by the geographic area where the work was performed:



	Three Months Ended				Six Months Ended
	December 31, 2018		December 31, 2017		December 31, 2018		December 31, 2017
	(In thousands)
United States	$	329,513	$	259,072	$	639,650	$	480,845
Canada	9,714		22,996		16,795		69,855
Other international	1,341		843		2,634		2,121
Total Revenue	$	340,568	$	282,911	$	659,079	$	552,821