Total liability for proportionate share of joint venture debt.

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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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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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No definition available.

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- Definition

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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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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Debt (Summary of Senior Notes) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Jul. 01, 2016	Feb. 29, 2016
Debt Instrument [Line Items]
Joint venture debt company proportionate share total	$ 52,500,000
Net premiums, discounts, and issuance costs	(13,016,000)	$ (12,984,000)
Senior notes	3,109,984,000	3,110,016,000
7.625% unsecured senior notes due October 2017 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 123,000,000	$ 123,000,000
Stated interest rate	7.625%	7.625%
4.250% unsecured senior notes due March 2021 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 700,000,000	$ 700,000,000	$ 400,000,000	$ 300,000,000
Stated interest rate	4.25%	4.25%	4.25%	4.25%
5.500% unsecured senior notes due March 2026 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 700,000,000	$ 700,000,000		$ 700,000,000
Stated interest rate	5.50%	5.50%		5.50%
5.000% unsecured senior notes due January 2027 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 600,000,000	$ 600,000,000	$ 600,000,000
Stated interest rate	5.00%	5.00%	5.00%
7.875% unsecured senior notes due June 2032 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 300,000,000	$ 300,000,000
Stated interest rate	7.875%	7.875%
6.375% unsecured senior notes due May 2033 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 400,000,000	$ 400,000,000
Stated interest rate	6.375%	6.375%
6.000% unsecured senior notes due February 2035 \| Senior Notes
Debt Instrument [Line Items]
Face amount	$ 300,000,000	$ 300,000,000
Stated interest rate	6.00%	6.00%