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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract Liabilities, Current | $ 72,241 | $ 59,204 | $ 0
Contract Liabilities, Non-Current |  | $ 19,864 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract Liabilities, Current | 72,241 |  |
Contract Liabilities, Non-Current | $ 26,271 |  |

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