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Revenues
 6 Months Ended
Jun. 27, 2021
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Disaggregated Revenues
Disaggregated revenues by customer type were as follows (in thousands):

Three Months Ended June 27, 2021
GMSNSSTotal
DoD$194,598 $81,621 $276,219 
Other U.S. government agencies267,592 131,848 399,440 
Commercial and non-U.S. customers49,153 22,386 71,539 
Total$511,343 $235,855 $747,198 
Six Months Ended June 27, 2021
GMSNSSTotal
DoD$357,031 $163,821 $520,852 
Other U.S. government agencies536,377 251,943 788,320 
Commercial and non-U.S. customers139,496 47,097 186,593 
Total$1,032,904 $462,861 $1,495,765 
Three Months Ended June 28, 2020
GMSNSSTotal
DoD$204,634 $62,096 $266,730 
Other U.S. government agencies260,714 49,434 310,148 
Commercial and non-U.S. customers42,506 23,919 66,425 
Total$507,854 $135,449 $643,303 

Six Months Ended June 28, 2020
GMSNSSTotal
DoD$392,240 $129,275 $521,515 
Other U.S. government agencies510,660 120,156 630,816 
Commercial and non-U.S. customers62,398 45,827 108,225 
Total$965,298 $295,258 $1,260,556 

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

Three Months Ended June 27, 2021
GMSNSSTotal
Cost-reimbursable$285,552 $93,653 $379,205 
Fixed-price159,955 79,036 238,991 
Time and materials65,836 63,166 129,002 
Total$511,343 $235,855 $747,198 
Six Months Ended June 27, 2021
GMSNSSTotal
Cost-reimbursable$546,472 $183,747 $730,219 
Fixed-price341,259 161,553 502,812 
Time and materials145,173 117,561 262,734 
Total$1,032,904 $462,861 $1,495,765 

Three Months Ended June 28, 2020
GMSNSSTotal
Cost-reimbursable$299,906 $34,288 $334,194 
Fixed-price158,247 53,693 211,940 
Time and materials49,701 47,468 97,169 
Total$507,854 $135,449 $643,303 
Six Months Ended June 28, 2020
GMSNSSTotal
Cost-reimbursable$565,986 $71,192 $637,178 
Fixed-price320,285 122,650 442,935 
Time and materials79,027 101,416 180,443 
Total$965,298 $295,258 $1,260,556 
Disaggregated revenues by geographic location were as follows (in thousands):
Three Months Ended June 27, 2021
GMSNSSTotal
United States$266,268 $234,706 $500,974 
International245,075 1,149 246,224 
Total$511,343 $235,855 $747,198 
Six Months Ended June 27, 2021
GMSNSSTotal
United States$555,040 $460,576 $1,015,616 
International477,864 2,285 480,149 
Total$1,032,904 $462,861 $1,495,765 
Three Months Ended June 28, 2020
GMSNSSTotal
United States$277,536 $133,875 $411,411 
International230,318 1,574 231,892 
Total$507,854 $135,449 $643,303 
Six Months Ended June 28, 2020
GMSNSSTotal
United States$526,446 $292,014 $818,460 
International438,852 3,244 442,096 
Total$965,298 $295,258 $1,260,556 
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 June 27, 2021 and December 31, 2020 was $1,497.4 million and $1,722.0 million, respectively.
As of June 27, 2021, the Company expects to recognize approximately 89.2% and 10.8% 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):
June 27,December 31,
20212020
Contract assets$376,154 $360,552 
Contract liabilities$88,903 $106,475 
The increase in contract assets of $15.6 million during the six months ended June 27, 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 $17.6 million during the six months ended June 27, 2021 was primarily due to the timing of advance payments from customers offset by revenue recognized during the period.
The Company recognized $87.9 million and $33.4 million during the six months ended June 27, 2021 and June 28, 2020, respectively, relating to amounts that were included in the beginning balance of contract liabilities for each of the periods. The Company recognized $3.4 million and $1.1 million during the three months ended June 27, 2021 and June 28, 2020, respectively, relating to amounts that were included in the beginning balance of contract liabilities for each of the periods.