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New Accounting Standards Implemented - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
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Accounting Changes and Error Corrections [Abstract] |  |  |
Contract assets - current | $ 45,836 | $ 45,468 |
Contract assets - non-current | 5,531 |  |
Contract liability - current | (17,915) | (18,945) |
Contract liability - non-current | (1,750) | (1,571) |
Net contract assets (liabilities) | $ 31,702 | $ 24,952 |

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