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Revenues
 3 Months Ended
Mar. 28, 2021
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Disaggregated Revenues
Disaggregated revenues by customer type were as follows (in thousands):

Three Months Ended March 28, 2021
GMSNSSTotal
DoD$162,433 $82,200 $244,633 
Other U.S. government agencies268,785 120,095 388,880 
Commercial and non-U.S. customers90,343 24,711 115,054 
Total$521,561 $227,006 $748,567 

Three Months Ended March 29, 2020
GMSNSSTotal
DoD$187,605 $67,178 $254,783 
Other U.S. government agencies250,042 70,722 320,764 
Commercial and non-U.S. customers19,797 21,909 41,706 
Total$457,444 $159,809 $617,253 

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

Three Months Ended March 28, 2021
GMSNSSTotal
Cost-reimbursable$260,920 $90,093 $351,013 
Fixed-price181,304 82,517 263,821 
Time and materials79,337 54,396 133,733 
Total$521,561 $227,006 $748,567 

Three Months Ended March 29, 2020
GMSNSSTotal
Cost-reimbursable$266,080 $36,903 $302,983 
Fixed-price162,038 68,958 230,996 
Time and materials29,326 53,948 83,274 
Total$457,444 $159,809 $617,253 
Disaggregated revenues by geographic location were as follows (in thousands):
Three Months Ended March 28, 2021
GMSNSSTotal
United States$288,772 $225,870 $514,642 
International232,789 1,136 233,925 
Total$521,561 $227,006 $748,567 

Three Months Ended March 29, 2020
GMSNSSTotal
United States$248,909 $158,139 $407,048 
International208,535 1,670 210,205 
Total$457,444 $159,809 $617,253 
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 March 28, 2021 and December 31, 2020 was $1,744.1 million and $1,722.0 million, respectively.
As of March 28, 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):
March 28,December 31,
20212020
Contract assets$395,455 $360,552 
Contract liabilities$74,197 $106,475 
The increase in contract assets of $34.9 million during the three months ended March 28, 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 $(32.3) million during the three months ended March 28, 2021 was primarily due to the timing of advance payments from customers offset by revenue recognized during the period.The Company recognized $84.4 million and $38.0 million during the three months ended March 28, 2021 and March 29, 2020, respectively, relating to amounts that were included in the beginning balance of contract liabilities for each of the periods.