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Contract Assets and Contract Liabilities
 9 Months Ended
Sep. 26, 2021
Revenue from Contract with Customer [Abstract]  
Contract Assets and Contract Liabilities Revenues
Disaggregated Revenues
Disaggregated revenues by customer type were as follows (in thousands):

Three Months Ended September 26, 2021
GMSNSSTotal
DoD$129,261 $87,886 $217,147 
Other U.S. government agencies288,543 131,212 419,755 
Commercial and non-U.S. customers30,274 22,338 52,612 
Total$448,078 $241,436 $689,514 
Nine Months Ended September 26, 2021
GMSNSSTotal
DoD$486,292 $251,706 $737,998 
Other U.S. government agencies824,920 383,155 1,208,075 
Commercial and non-U.S. customers169,770 69,436 239,206 
Total$1,480,982 $704,297 $2,185,279 
Three Months Ended September 27, 2020
GMSNSSTotal
DoD$203,693 $65,354 $269,047 
Other U.S. government agencies270,344 57,379 327,723 
Commercial and non-U.S. customers47,309 22,161 69,470 
Total$521,346 $144,894 $666,240 

Nine Months Ended September 27, 2020
GMSNSSTotal
DoD$595,933 $194,629 $790,562 
Other U.S. government agencies781,004 177,535 958,539 
Commercial and non-U.S. customers109,706 67,988 177,694 
Total$1,486,643 $440,152 $1,926,795 

Revenues by contract type were as follows (in thousands):

Three Months Ended September 26, 2021
GMSNSSTotal
Cost-reimbursable$218,152 $89,948 $308,100 
Fixed-price191,530 85,287 276,817 
Time and materials38,396 66,201 104,597 
Total$448,078 $241,436 $689,514 
Nine Months Ended September 26, 2021
GMSNSSTotal
Cost-reimbursable$764,625 $273,695 $1,038,320 
Fixed-price532,789 246,840 779,629 
Time and materials183,568 183,762 367,330 
Total$1,480,982 $704,297 $2,185,279 

Three Months Ended September 27, 2020
GMSNSSTotal
Cost-reimbursable$302,795 $35,656 $338,451 
Fixed-price161,024 62,568 223,592 
Time and materials57,527 46,670 104,197 
Total$521,346 $144,894 $666,240 
Nine Months Ended September 27, 2020
GMSNSSTotal
Cost-reimbursable$868,780 $106,848 $975,628 
Fixed-price481,309 185,218 666,527 
Time and materials136,554 148,086 284,640 
Total$1,486,643 $440,152 $1,926,795 
Disaggregated revenues by geographic location were as follows (in thousands):
Three Months Ended September 26, 2021
GMSNSSTotal
United States$246,903 $239,723 $486,626 
International201,175 1,713 202,888 
Total$448,078 $241,436 $689,514 
Nine Months Ended September 26, 2021
GMSNSSTotal
United States$801,944 $700,299 $1,502,243 
International679,038 3,998 683,036 
Total$1,480,982 $704,297 $2,185,279 
Three Months Ended September 27, 2020
GMSNSSTotal
United States$275,785 $142,890 $418,675 
International245,561 2,004 247,565 
Total$521,346 $144,894 $666,240 
Nine Months Ended September 27, 2020
GMSNSSTotal
United States$802,230 $434,904 $1,237,134 
International684,413 5,248 689,661 
Total$1,486,643 $440,152 $1,926,795 
Remaining Performance Obligations
The Company’s remaining performance obligations balance represents the expected revenue to be recognized for the satisfaction of remaining performance obligations on existing contracts. This balance excludes unexercised contract option years and task orders that may be issued underneath an indefinite delivery, indefinite quantity contract. The remaining performance obligations balance as of September 26, 2021 and December 31, 2020 was $1,701.1 million and $1,722.0 million, respectively.
As of September 26, 2021, the Company expects to recognize approximately 87.8% and 12.2% of the remaining performance obligations balance as revenue over the next year and thereafter, respectively.
Contract Assets and Contract Liabilities
Contract assets consist of unbilled receivables, which represent rights to payment for work or services completed but not billed as of the reporting date. Contract assets are recorded as unbilled receivables within accounts receivable, net on the condensed consolidated balance sheets.
Contract liabilities are advances and milestone payments from customers on certain contracts that exceed revenue earned to date. Contract liabilities are recorded as customer advances and billings in excess of costs on the condensed consolidated balance sheets.
Contract assets and contract liabilities consisted of the following as of the dates presented (in thousands):
September 26,December 31,
20212020
Contract assets$358,345 $360,552 
Contract liabilities$106,221 $106,475 
The decrease in contract assets of $2.2 million during the nine months ended September 26, 2021 was primarily due to the timing of billings, partially offset by revenue recognized related to the satisfaction of performance obligations.
The decrease in contract liabilities of $0.3 million during the nine months ended September 26, 2021 was primarily due to the timing of advance payments from customers offset by revenue recognized during the period.
The Company recognized $89.5 million and $34.6 million during the nine months ended September 26, 2021 and September 27, 2020, respectively, relating to amounts that were included in the beginning balance of contract liabilities for each of the periods. The Company recognized $5.9 million and $1.2 million during the three months ended September 26, 2021 and September 27, 2020, respectively, relating to amounts that were included in the beginning balance of contract liabilities for each of the periods.