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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Accounts receivable, net | $ 115,462 | [1] | $ 125,010 | [1] | $ 86,017 | $ 95,863
Accounts receivable retainage, net | 36,485 |  | 30,189 |  | 19,119 | 16,976
Contract Assets: |  |  |  |  |  |
Costs and estimated earnings in excess of billings | 195,027 | [1] | 185,960 | [1] | 195,391 | 202,243
Contract Liabilities: |  |  |  |  |  |
Billings in excess of cost and estimated earnings | 26,561 |  | 33,984 |  | 34,896 | 26,618
Billings in excess of cost and estimated earnings, non-current | 6,082 |  | 6,631 |  | 5,035 | 5,560
Total contract liabilities | $ 32,643 |  | $ 40,615 |  | $ 39,931 | $ 32,178
[1] | Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2021 and December 31, 2020 of $155,878 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at June 30, 2021 and December 31, 2020 of $32,318 and $33,335, respectively. See Note 12.

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123366838&loc=d3e3073-115593 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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