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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Schedule of Accounts Receivable, Net of Allowance, and Contract Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Receivables [Abstract] |  |
Contract billings | $ 805,000 | $ 860,400
Less allowance | (20,500) | (10,100)
Accounts receivable, net of allowance | 784,488 | 850,326
Accounts Receivable, Net of Allowance, and Contract Assets [Abstract] |  |
Retainage | 287,700 | 345,200
Unbilled receivables | 682,000 | 679,400
Contract assets | $ 969,743 | $ 1,024,568

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