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Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018
--- | --- | ---
Contract liabilities |  |
Customer deposits - current | $ 36,967 |
Deferred revenue - current | 11,307 |
Deferred revenue - long-term | $ 1,374 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Contract liabilities |  |
Customer deposits - current |  | $ 36,937
Deferred revenue - current |  | 9,571
Deferred revenue - long-term |  | 182
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606 |  |
Contract liabilities |  |
Customer deposits - current |  | $ 30
Customer deposits, Change |  | 0.10%
Deferred revenue - current |  | $ 1,736
Deferred revenue - current, Change |  | 18.10%
Deferred revenue - long-term |  | $ 1,192
Deferred revenue - long-term, Change |  | 654.90%

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