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Contract Assets and Liabilities - Components of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Contract assets |  |
Costs in excess of billings and estimated earnings | $ 31,894 | $ 44,315
Retainage receivable | 35,204 | 32,873
Total contract assets | 67,098 | 77,188
Change in costs in excess of billings and estimated earnings | (12,421) |
Change in retainage receivable | 2,331 |
Change in total contract assets | (10,090) | 13,378
Contract liabilities |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 46,020 | 40,662
Provisions for losses | 628 | 1,708
Total contract liabilities | 46,648 | 42,370
Change in billings in excess of costs and estimated earnings | 5,358 |
Change in provisions for losses | (1,080) |
Change in total contract liabilities | $ 4,278 | $ (6,446)

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