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Accrued Liabilities (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Contract liabilities | $ 9,025 |
Other accruals | 20,581 | $ 16,557
Cumulative effect of adopting ASC 606 [Member] |  |
Increased Contract loss | 14,900 |
Contract liabilities | 700 |
Other accruals | $ 1,600 |

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