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Summary of Significant Accounting Policies Schedule of Other Current Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Current Assets [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 0 | $ 9,737 | $ 0
Document Fiscal Year Focus | 2018 |  |
Goodwill | $ 314,143 | 331,884 | $ 0
Investments | 41,287 | 41,636 |
Derivative Asset | 17,482 | 14,515 |
Parent Company [Member] |  |  |
Other Current Assets [Line Items] |  |  |
Other Assets | $ 403,827 | $ 427,127 |

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