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Guarantee Of Registered Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Guarantor Obligations [Line Items]
Senior notes aggregate outstanding principal balance	$ 422,900,000
6.875% Senior notes due 2020
Guarantor Obligations [Line Items]
Senior Note Maturity Year	2020
Debt instrument interest rate stated percentage	6.875%
7.875% Senior Notes Due 2040 [Member]
Guarantor Obligations [Line Items]
Senior Note Maturity Year	2040
Debt instrument interest rate stated percentage	7.875%
7.20% Senior notes due 2027
Guarantor Obligations [Line Items]
Senior Note Maturity Year	2027
Debt instrument interest rate stated percentage	7.20%
Notes Issued	$ 112,100,000

X

- Definition

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

+ References

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-SubTopic 10
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fair value of notes issued in noncash investing and financing activities.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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