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Costs and Estimated Earnings and Billings on Uncompleted Contracts | 12 Months Ended
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Dec. 31, 2017
Contractors [Abstract] |
Costs and Estimated Earning and Billings on Uncompleted Contracts | Costs and Estimated Earnings and Billings on Uncompleted Contracts Billing practices for our contracts are governed by the contract terms of each project based on progress toward completion approved by the owner, achievement of milestones or pre-agreed schedules. Billings do not necessarily correlate with revenue recognized under the percentage-of-completion method of accounting. The current liability, “Billings in excess of costs and estimated earnings on uncompleted contracts,” represents billings in excess of revenues recognized. The current asset, “Costs and estimated earnings in excess of billings on uncompleted contracts,” represents revenues recognized in excess of amounts billed to the customer, which are usually billed during normal billing processes following achievement of contractual requirements. In addition, revenue associated with unapproved change orders and claims is also included when realization is probable and amounts can be reliably determined. The two tables below set forth the costs incurred and earnings accrued on uncompleted contracts (revenues) compared with the billings on those contracts through December 31, 2017 and 2016 and reconcile the net excess billings to the amounts included in the consolidated balance sheets at those dates (amounts in thousands).
| As of December 31,
| 2017 |  | 2016
Costs incurred and estimated earnings on uncompleted contracts | $ | 2,380,866 |  |  | $ | 1,749,328 |
Billings on uncompleted contracts | (2,406,128 | ) |  | (1,780,723 | )
Excess of billings over costs incurred and estimated earnings | $ | (25,262 | ) |  | $ | (31,395 | )
Included in the accompanying balance sheets under the following captions:
| As of December 31,
| 2017 |  | 2016
Costs and estimated earnings in excess of billings on uncompleted contracts | $ | 37,112 |  |  | $ | 32,705 |
Billings in excess of costs and estimated earnings on uncompleted contracts | (62,374 | ) |  | (64,100 | )
Net amount of costs and estimated earnings on uncompleted contracts below billings | $ | (25,262 | ) |  | $ | (31,395 | )
Revenues recognized and billings on uncompleted contracts include cumulative amounts recognized as revenues and billings in prior years.

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- Definition The entire disclosure for long-term contracts or programs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -URI http://asc.fasb.org/subtopic&trid=2197326 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -URI http://asc.fasb.org/topic&trid=2145070 + Details
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