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Revenue Recognition (Details 2) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Contract Liabilities |  |
Contract assets | $ 124,057 | $ 78,260
Contract liabilities | (46,186) | (28,919)
Net contract assets (liabilities) | 77,871 | $ 49,341
Net Period Change [Member] |  |
Contract Liabilities |  |
Contract assets | 45,797 |
Contract liabilities | (17,267) |
Net contract assets (liabilities) | $ 28,530 |

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References No definition available. + Details
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