Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,300,000	$ 1,300,000
Unamortized debt issuance costs	(13,371)	(17,079)
Total debt, net	1,286,629	1,282,921
Senior Unsecured Notes Due September 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 500,000	500,000
Stated interest rate	7.75%
Senior Unsecured Notes Due December 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 800,000	$ 800,000
Stated interest rate	7.125%

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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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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