We disaggregate our revenue arrangements by contract type, customer, and whether the Company performs on the contract as the prime or subcontractor. We believe that these categories allow for a better understanding of the nature, amount, timing, and uncertainty of revenue and cash flows arising from our contracts.

The Company generated revenue on our cost-plus-fee, firm fixed-price, and time-and-materials contracts as follows during the three months ended September 30, 2019 and 2018 (in thousands):

	Three Months Ended						Three Months Ended
	September 30, 2019						September 30, 2018
	Domestic		International		Total		Domestic		International		Total
Cost-plus-fee	$	747,714	$	—	$	747,714	$	641,527	$	—	$	641,527
Firm fixed-price		391,536		26,440		417,976		321,071		22,933		344,004
Time and materials		185,523		12,179		197,702		163,925		16,408		180,333
Total	$	1,324,773	$	38,619	$	1,363,392	$	1,126,523	$	39,341	$	1,165,864

The Company generated revenue from our primary customer groups as follows during the three months ended September 30, 2019 and 2018 (in thousands):

	Three Months Ended						Three Months Ended
	September 30, 2019						September 30, 2018
	Domestic		International		Total		Domestic		International		Total
Department of Defense	$	937,640	$	—	$	937,640	$	818,266	$	—	$	818,266
Federal civilian agencies		363,993		—		363,993		292,202		—		292,202
Commercial and other		23,140		38,619		61,759		16,055		39,341		55,396
Total	$	1,324,773	$	38,619	$	1,363,392	$	1,126,523	$	39,341	$	1,165,864

The Company generated revenue as either the prime or subcontractor as follows during the three months ended September 30, 2019 and 2018 (in thousands):

	Three Months Ended						Three Months Ended
	September 30, 2019						September 30, 2018
	Domestic		International		Total		Domestic		International		Total
Prime contractor	$	1,197,634	$	38,619	$	1,236,253	$	1,050,531	$	39,341	$	1,089,872
Subcontractor		127,139		—		127,139		75,992		—		75,992
Total	$	1,324,773	$	38,619	$	1,363,392	$	1,126,523	$	39,341	$	1,165,864

For many of our fixed price revenue arrangements and for revenue arrangements that have award or incentive fees, the Company uses an estimate at completion (EAC) to measure progress towards the complete satisfaction of its performance obligations. For these revenue arrangements, revenue is recognized over time primarily using a cost-to-cost input method based on the ratio of costs incurred to date to total estimated costs at completion. The EAC process requires the Company to use professional judgment when assessing risks, estimating contract revenue and costs, estimating variable consideration, and making assumptions for schedule and technical issues. The Company periodically reassesses its EAC assumptions and updates its estimates as needed. When estimates of total costs to be incurred on a contract exceed total revenue, a provision for the entire loss on the contract is recorded in the period in which the loss is determined.

Based on changes in a contract’s EAC, a cumulative adjustment to revenue will be recorded. During the three months ended September 30, 2019 and 2018, we recognized an increase to income before income taxes of $6.5 million ($0.19 per diluted share) and $6.4 million ($0.19 per diluted share), respectively, from EAC adjustments. The Company used its statutory tax rate when calculating the impact to diluted earnings per share.

The Company’s remaining performance obligations balance as of period end represents the expected revenue to be recognized for the satisfaction of remaining performance obligations on our existing contracts. This balance excludes unexercised contract option years and task orders that may be issued underneath an Indefinite Delivery/Indefinite Quantity (IDIQ) vehicle until such task orders are awarded. The remaining performance obligations balance generally increases with the execution of new contracts and converts into revenue as our contractual performance obligations are satisfied.

The Company continues to monitor this balance as it is subject to change from execution of new contracts, contract modifications or extensions, government deobligations, or early terminations. Based on this analysis, an adjustment to the period end balance may be required. Our remaining performance obligations balance as of September 30, 2019 was $7.1 billion.

The Company expects to recognize approximately 73 percent of our remaining performance obligations balance as revenue over the next year and the remaining 27 percent thereafter.