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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Cash Flow Supplemental Information [Line Items] |
Schedule of Supplemental Cash Flow Information [Table Text Block] | Supplemental Disclosure of Cash Flow Information:
(Dollars in thousands) Year Ended December 31, |  | 2018 |  | 2017 |  | 2016
Cash paid during the period for: |  |  |  |  |  |
Income taxes |  | $ | 34,980 |  |  | $ | 40,334 |  |  | $ | 21,437 |
Interest on long-term debt and investment agreements |  | 231,734 |  |  | 39,112 |  |  | 4,537 |
Non-cash financing activities: |  |  |  |  |  |
Increase in long-term debt in exchange for auction market preferred shares |  | 187,220 |  |  | — |  |  | — |
Decrease in long-term debt as a result of an exchange for investment securities |  | — |  |  | 55,426 |  |  | — |
Rehabilitation exit transaction discharge of all Deferred Amounts and cancellation of certain General Account Surplus Notes |  | 1,918,561 |  |  | — |  |  | — |
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flow: |  |  |  |  |  |
Cash and cash equivalents |  | $ | 63,089 |  |  | $ | 623,703 |  |  | $ | 91,025 |
Restricted cash |  | 19,405 |  |  | — |  |  | — |
Variable Interest Entity Restricted cash |  | 999 |  |  | 978 |  |  | 4,873 |
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows |  | $ | 83,493 |  |  | $ | 624,681 |  |  | $ | 95,898 |

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- Definition [Line Items] for Schedule of Cash Flow Supplemental Information [Table] + References No definition available. + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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