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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Revenue Disaggregated by Geographic Location and Contract Type
The following tables present Quanta’s revenue disaggregated by geographic location, as determined by the job location, and contract type (in thousands):
Three Months Ended March 31,
20212020
By primary geographic location:
United States$2,206,116 81.6 %$2,268,086 82.1 %
Canada413,846 15.3 %384,225 13.9 %
Australia55,107 2.0 %51,050 1.8 %
Others28,512 1.1 %60,734 2.2 %
Total revenues$2,703,581 100.0 %$2,764,095 100.0 %

Three Months Ended March 31,
20212020
By contract type:
Unit-price contracts$976,562 36.1 %$974,651 35.3 %
Cost-plus contracts662,772 24.5 %688,084 24.9 %
Fixed price contracts1,064,247 39.4 %1,101,360 39.8 %
Total revenues$2,703,581 100.0 %$2,764,095 100.0 %
Contract Assets and Liabilities
Contract assets and liabilities consisted of the following (in thousands):
March 31, 2021December 31, 2020
Contract assets$518,256 $453,832 
Contract liabilities$499,527 $528,864 
Composition of the Allowance for Credit Losses
Activity in Quanta’s allowance for credit losses consisted of the following (in thousands):
 Three Months Ended
March 31,
 20212020
Balance at beginning of period$16,546 $9,398 
Cumulative effect of adoption of new credit loss standard— 5,067 
Provision for credit losses43 273 
Direct write-offs charged against the allowance(140)(292)
Balance at end of period$16,449 $14,446 
Cash and Cash Equivalents
Amounts related to Quanta’s cash and cash equivalents based on geographic location of the bank accounts were as follows (in thousands):
 March 31, 2021December 31, 2020
Cash and cash equivalents held in domestic bank accounts$170,128 $156,122 
Cash and cash equivalents held in foreign bank accounts30,090 28,498 
Total cash and cash equivalents$200,218 $184,620 
Amounts related to cash and cash equivalents held by joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands):
 March 31, 2021December 31, 2020
Cash and cash equivalents held by domestic joint ventures$4,091 $7,714 
Cash and cash equivalents held by foreign joint ventures3,780 3,973 
Total cash and cash equivalents held by joint ventures7,871 11,687 
Cash and cash equivalents held by captive insurance company131,839 85,014 
Cash and cash equivalents not held by joint ventures or captive insurance company60,508 87,919 
Total cash and cash equivalents$200,218 $184,620 
Significant Estimates Used by Management in Determining Fair Values of Intangible Assets The following table presents the rates during the three months ended March 31, 2021 and the ranges of rates and weighted average rates for the year ended December 31, 2020 based on acquisition date fair values for discount and attrition rates used in the valuation of customer relationship intangible assets:
 20212020
RateRangeWeighted Average
Discount rates
22%
19% to 25%
20%
Customer attrition rates
25%
10% to 43%
13%
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consisted of the following (in thousands):
 March 31, 2021December 31, 2020
Accounts payable, trade$842,110 $798,023 
Accrued compensation and related expenses353,391 378,002 
Other accrued expenses310,524 333,769 
Accounts payable and accrued expenses$1,506,025 $1,509,794