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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively) | $ 85,985 |  | $ 85,121
Accounts receivable retainage, net | 13,516 |  | 17,484
Contract Assets: |  |  |
Costs and estimated earnings in excess of billings | 86,842 | $ 104,852 | $ 104,852
Contract Liabilities: |  |  |
Billings in excess of cost and estimated earnings | 30,706 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accounts receivable, net (including amounts in VIEs of $374 and $328, respectively) |  | 85,121 |
Accounts receivable retainage, net |  | 17,484 |
Contract Assets: |  |  |
Costs and estimated earnings in excess of billings | $ 93,214 | 95,658 |
Contract Liabilities: |  |  |
Billings in excess of cost and estimated earnings |  | $ 27,248 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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