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Contract Assets and Liabilities | 3 Months Ended
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Mar. 31, 2019
Contract with Customer, Asset and Liability [Abstract] |
Contract Assets and Liabilities | 12. Contract Assets and Liabilities Contract assets includes unbilled amounts typically resulting from sales under contracts when the cost-to-cost method of revenue recognition is utilized, and revenue recognized exceeds the amount billed to the customer. Contract assets are transferred to Accounts receivable, net when the entitlement to pay becomes unconditional. Contract liabilities include advance payments and billings in excess of revenue recognized. Contract liabilities are included in Accrued liabilities in the Consolidated Balance Sheets. Contract assets and Contract liabilities are reported on the Consolidated Balance Sheets in a net position on a contract-by-contract basis at the end of each reporting period. As of March 31, 2019 and December 31, 2018 Contract assets and contract liabilities consisted of the following:
(in thousands) | March 31, 2019 | December 31, 2018
Contract assets | $57,869 | $57,447
Contract liabilities | 9,865 | 9,025
Contract assets increased $0.4 million during the three month period ended March 31, 2019. The increase was primarily due to an increase in unbilled revenue related to the satisfaction of performance obligations, in excess of the amounts billed to customers. There were no impairment losses related to our Contract assets during the three month period ended March 31, 2019. Contract liabilities increased $0.8 million during the three month period ended March 31, 2019, primarily due to increased billings in excess of revenue recognized. Revenue recognized for the three month period ended March 31, 2019, that was included in the Contract liability balance as of December 31, 2018 was $3.7 million, and included revenue in the MC and AEC segments.

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