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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Tables)
 12 Months Ended
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