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Contract Assets and Liabilities | 12 Months Ended
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Dec. 31, 2018
Contract Assets And Liabilities |
Contract Assets and Liabilities | 12. Contract Assets and Liabilities 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. Contract assets and contract liabilities were as follows:
(in thousands) | December 31, 2018 | December 31, 2017
Contract assets | $57,447 | $ -
Contract liabilities | 9,025 | -
Contract assets increased $10.0 million during the year ended December 31, 2018 as compared to the January 1, 2018 opening balance sheet, as adjusted for the adoption of ASC 606 (see Note 2). 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 year ended December 31, 2018. Contract liabilities increased $5.8 million during the year ended December 31, 2018, as compared to the January 1, 2018 opening balance sheet, as adjusted for the adoption of ASC 606, primarily due to increased billings in excess of revenue recognized. Revenue recognized for the year ended December 31, 2018, that was included in the Contract liability balance at the beginning of the year was $3.2 million, and represented revenue in the MC and ASC reporting units.

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