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Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Change in amounts due for unfulfilled performance obligations | $ (544,780) |  | $ (567,911) | $ 0
Deferred Costs |  |  | 281,700 |
Pension Cost (Reversal of Cost) |  | $ 74 |  | 221
Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  | $ 221 |  | $ 663
Retained Earnings [Member] |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | 172,200 |
Deferred Charges And Other Assets [Member] |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  | 268,000 |
Deferred Revenue [Member] |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  | 38,000 |
Deferred Tax Liability [Member] |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  | $ 57,800 |

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