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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract Assets, Non-Current |  | $ 59,204
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 Assets, Non-Current | $ 67,072 |
Contract Liabilities, Non-Current | $ 23,253 |

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