Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current portion of long-term debt:
DIP credit agreement with an average interest rate of 7.5% at June 30, 2020	$ 8,000	$ 0
Current portion of long-term debt	124,000	108,200
Long-term debt:
Long-term debt	$ 34,000	663,216
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding	7.50%
Current portion of long-term debt
Current portion of long-term debt:
Current portion of long-term debt	$ 132,000	108,200
Long-term Debt
Long-term debt:
Total principal amount	34,000	666,500
Less: unamortized discount	0	(971)
Less: debt issuance costs, net	0	(2,313)
Long-term debt	34,000	663,216
Senior Subordinated Notes \| Long-term Debt
Long-term debt:
6.625% senior subordinated notes due 2021	0	$ 650,000
Unit Credit Agreement [Member]
Current portion of long-term debt:
Unit credit agreement with an average interest rate of 2.3% and 4.0% at June 30, 2020 and December 31, 2019, respectively	$ 124,000
Long-term debt:
Revolving credit facility interest rate	2.30%	4.00%
Unit Credit Agreement [Member] \| Current portion of long-term debt
Current portion of long-term debt:
Unit credit agreement with an average interest rate of 2.3% and 4.0% at June 30, 2020 and December 31, 2019, respectively		$ 108,200
Superior Credit Agreement [Member]
Long-term debt:
Revolving credit facility interest rate	2.20%	3.90%
Superior Credit Agreement [Member] \| Long-term Debt
Long-term debt:
Superior credit agreement with an average interest rate of 2.2% and 3.9% at June 30, 2020 and December 31, 2019, respectively	$ 34,000	$ 16,500

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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The effective interest rate at the end of the reporting period.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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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