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New Accounting Standards Implemented - Schedule of Contract Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
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Accounting Changes and Error Corrections [Abstract] |  |  |
Billings in excess of costs | $ 5,087 | $ 7,516 |
Advances from customers on uncompleted contracts | 14,578 | 13,000 |
Total contract liabilities | 19,665 | 20,516 |
Less: current portion | 17,915 | 18,945 |
Contract liabilities – non-current | $ 1,750 | $ 1,571 |

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