Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-term debt:
Long-term debt	$ 143,600	$ 663,216
Long-term Debt
Long-term debt:
Total principal amount	143,600	666,500
Less: unamortized discount	0	(971)
Less: debt issuance costs, net	0	(2,313)
Long-term debt	143,600	663,216
Senior Subordinated Notes \| Long-term Debt
Long-term debt:
Predecessor 6.625% senior subordinated notes due 2021	0	$ 650,000
Interest percentage of senior subordinated notes		6.625%
Predecessor Credit Agreement [Member] \| Current portion of long-term debt
Current portion of long-term debt:
Line of Credit, Current	$ 0	$ 108,200
Long-term debt:
Revolving credit facility interest rate		4.00%
Successor Exit Facility
Long-term debt:
Revolving credit facility interest rate	6.60%
Successor Exit Facility \| Current portion of long-term debt
Current portion of long-term debt:
Line of Credit, Current	$ 400	$ 0
Successor Exit Facility \| Long-term Debt
Long-term debt:
Long-term Line of Credit	131,600	0
Superior Credit Agreement [Member] \| Long-term Debt
Long-term debt:
Long-term Line of Credit	$ 12,000	$ 16,500
Revolving credit facility interest rate	2.10%	3.90%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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