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Construction Contracts
6 Months Ended
Jun. 30, 2022
Contractors [Abstract]  
Construction Contracts Construction Contracts
Construction contract costs and estimated earnings in excess of billings represent reimbursable costs and amounts earned under contracts in progress as of the balance sheet date. Such amounts become billable according to contract terms, which usually consider the passage of time, achievement of certain milestones, or completion of the project. The Company expects to bill and collect substantially all construction contract costs and estimated earnings in excess of billings as of June 30, 2022 during the next twelve months.  
 
Billings in excess of construction contract costs and estimated earnings represent billings or collections on contracts made in advance of revenue recognized.

The following table summarizes the changes to the balances in the Company’s construction contract costs and estimated earnings in excess of billings account and the billings in excess of construction contract costs and estimated earnings account for the six months ended June 30, 2022 and 2021 (in thousands):
Six Months Ended 
June 30, 2022
Six Months Ended 
June 30, 2021
Construction contract costs and estimated earnings in excess of billingsBillings in excess of construction contract costs and estimated earningsConstruction contract costs and estimated earnings in excess of billingsBillings in excess of construction contract costs and estimated earnings
Beginning balance$243 $4,881 $138 $6,088 
Revenue recognized that was included in the balance at the beginning of the period— (4,881)— (6,088)
Increases due to new billings, excluding amounts recognized as revenue during the period— 15,442 — 4,191 
Transferred to receivables(361)— (464)— 
Construction contract costs and estimated earnings not billed during the period493 — 85 — 
Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion118 (367)326 (54)
Ending balance$493 $15,075 $85 $4,137 

The Company defers pre-contract costs when such costs are directly associated with specific anticipated contracts and their recovery is probable. Pre-contract costs of $1.0 million and $2.2 million were deferred as of June 30, 2022 and December 31, 2021, respectively. Amortization of pre-contract costs for the six months ended June 30, 2022 and 2021 was $0.5 million and $0.2 million, respectively.
 
Construction receivables and payables include retentions, which are amounts that are generally withheld until the completion of the contract or the satisfaction of certain restrictive conditions such as fulfillment guarantees. As of June 30, 2022 and December 31, 2021, construction receivables included retentions of $9.4 million and $3.1 million, respectively. The Company expects to collect substantially all construction receivables outstanding as of June 30, 2022 during the next twelve months. As of June 30, 2022 and December 31, 2021, construction payables included retentions of $10.3 million and $4.2 million, respectively. The Company expects to pay substantially all construction payables outstanding as of June 30, 2022 during the next twelve months.
The Company’s net position on uncompleted construction contracts comprised the following as of June 30, 2022 and December 31, 2021 (in thousands):
 June 30, 2022December 31, 2021
Costs incurred on uncompleted construction contracts$411,547 $379,993 
Estimated earnings16,423 15,115 
Billings(442,552)(399,746)
Net position$(14,582)$(4,638)
Construction contract costs and estimated earnings in excess of billings$493 $243 
Billings in excess of construction contract costs and estimated earnings(15,075)(4,881)
Net position$(14,582)$(4,638)
The above table reflects the net effect of projects closed as of June 30, 2022 and December 31, 2021, respectively.

The Company’s balances and changes in construction contract price allocated to unsatisfied performance obligations (backlog) as of June 30, 2022 and 2021 were as follows (in thousands):
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Beginning backlog$419,439 $38,838 $215,518 $71,258 
New contracts/change orders167,143 50,278 395,746 53,402 
Work performed(45,368)(18,897)(70,050)(54,441)
Ending backlog$541,214 $70,219 $541,214 $70,219 

The Company expects to complete a majority of the uncompleted contracts in place as of June 30, 2022 during the next 12 to 24 months.