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v3.21.2

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |  |  |
Allowance for doubtful accounts against contracts receivable | $ 0 |  | $ 0 |  | $ 0
Contract receivables | 45,924,000 |  | 45,924,000 |  | 44,412,000
Contract liabilities, retainage | $ 39,682,000 |  | $ 39,682,000 |  | 33,856,000
Percentage of receivables estimated to be collected in next fiscal year | 68.00% |  | 68.00% |  |
Contract liability recognized during period | $ 141,813,000 |  | $ 297,370,000 |  |
Contract liability revenue recognized |  | $ 132,225,000 |  | $ 278,491,000 |
Restricted cash | 6,411,000 | $ 4,895,000 | 6,411,000 | $ 4,895,000 |
Other current assets |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Restricted cash | $ 6,411,000 |  | $ 6,411,000 |  | $ 6,457,000

X
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