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Guarantee Of Registered Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Guarantor Obligations [Line Items]
Senior notes aggregate outstanding principal balance	$ 400,000,000
6.875% Senior notes due 2020(1)
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	$ 150,000,000

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

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-SubTopic 10
-Section S99
-Paragraph 1
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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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