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Segment Information - Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | $ 8,129,174 | $ 9,060,806 | $ 9,286,258
Items Excluded from Segment Assets: |  |  |
Recoverable Income Taxes | 644 | $ 62,425 |
Operating Segments |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 7,195,668 |  | 8,143,186
Segment Reconciling Items |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 782,730 |  | 1,126,404
Items Excluded from Segment Assets: |  |  |
Cash and Cash Equivalents | 150,132 |  | 5,484
Recoverable Income Taxes | $ 644 |  | $ 11,184

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