Debt (Narrative) (Details) - USD ($)	9 Months Ended
Sep. 30, 2020	Aug. 05, 2020
Debt Instrument [Line Items]
Current borrowing capacity	$ 97,300,000
Letters of Credit Outstanding, Amount	48,500,000
Debt repayment	$ 1,300,000,000
Original Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate on unsecured senior notes	7.125%
New Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 800,000,000
Stated interest rate on unsecured senior notes	7.125%
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 500,000,000
Stated interest rate on unsecured senior notes	7.75%
Amended Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 100,000,000
Borrwoing capacity		105.00%
Restricted Cash		$ 25,000,000
Cash collateralized		$ 52,400,000

Line Of Credit, Maximum Borrowing Capacity, Percent

No definition available.

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- Definition

Amount of assets pledged to secure a debt instrument.

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- Definition

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

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- Definition

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

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- Definition

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.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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