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Other Balance Sheet Items Other Balance Sheet Items (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract] |  |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current | $ 7,900 | $ 7,900 |
Operating Lease, Right-of-Use Asset | 9,139 | 9,139 | $ 0
Amortization of Other Deferred Charges | $ 8,600 | $ 17,100 |

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