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- Definition

Debt Instrument, Basis Spread On Variable Rate, Redemption Price Percentage

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- Definition

Debt Instrument, Redemption Period

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- Definition

Percentage of minimum principal amount of senior notes outstanding after initial redemption of up to 35% of principal.

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Percentage of principal amount of senior notes for redemption at a certain time period.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt Facilities - Senior Notes (Details) - USD ($)	1 Months Ended				3 Months Ended	12 Months Ended
Debt Facilities - Senior Notes (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2011
Debt Instrument [Line Items]
Interest rate (percent)								8.125%
Repayment of debt						$ 715,270,000	$ 153,473,000	$ 52,500,000
Unamortized premium	$ 1,987,000	$ 2,281,000			$ 2,281,000	1,987,000	2,281,000
Accrued and unpaid interest	67,077,000	29,116,000			29,116,000	67,077,000	29,116,000
Loss on debt extinguishment						289,000	156,990,000	$ 108,501,000
Senior Notes [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 45,366,000	32,954,000			32,954,000	$ 45,366,000	32,954,000
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued			$ 750,000,000
Interest rate (percent)	5.375%		5.375%			5.375%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member] \| Debt Instrument Redemption Period Prior to January 1, 2018 [Member]
Debt Instrument [Line Items]
Redemption price, percentage			100.00%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member] \| Maximum [Member] \| Debt Instrument Redemption Period Prior to January 1, 2018 [Member]
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount			1.00%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member] \| Treasury Rate [Member] \| Debt Instrument Redemption Period Prior to January 1, 2018 [Member]
Debt Instrument [Line Items]
Variable redemption price percentage			0.50%
Senior Notes [Member] \| 5.375% Senior Notes due 2022 [Member] \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt Instrument Redemption Period Prior to January 1, 2018 [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption			35.00%
Redemption price, percentage			105.375%
Senior notes indenture outstanding (percent)			65.00%
Redemption period			90 days
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued			$ 500,000,000
Interest rate (percent)			5.75%
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member] \| Debt Instrument Redemption Period Prior to January 1, 2020 [Member]
Debt Instrument [Line Items]
Redemption price, percentage			100.00%
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member] \| Maximum [Member] \| Debt Instrument Redemption Period Prior to January 1, 2020 [Member]
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount			1.00%
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member] \| Treasury Rate [Member] \| Debt Instrument Redemption Period Prior to January 1, 2020 [Member]
Debt Instrument [Line Items]
Variable redemption price percentage			0.50%
Senior Notes [Member] \| 5.750% Senior Notes due 2025 [Member] \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt Instrument Redemption Period Prior to January 1, 2018 [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption			35.00%
Redemption price, percentage			105.75%
Senior notes indenture outstanding (percent)			65.00%
Redemption period			90 days
Senior Notes [Member] \| 5.375% Senior Notes due 2022 and 5.750% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 14,622,000					$ 14,622,000
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued	$ 1,100,000,000					$ 1,100,000,000
Interest rate (percent)	5.875%					5.875%
Redemption price, percentage	100.00%
Unamortized debt issuance costs	$ 16,904,000					$ 16,904,000
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member] \| Debt Instrument Redemption Period Prior to January 15, 2021 [Member]
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member] \| Maximum [Member] \| Debt Instrument Redemption Period Prior to January 15, 2021 [Member]
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount	1.00%					1.00%
Senior Notes [Member] \| 5.875% Senior Notes Due 2026 [Member] \| Treasury Rate [Member] \| Debt Instrument Redemption Period Prior to January 15, 2021 [Member]
Debt Instrument [Line Items]
Variable redemption price percentage	0.50%
Senior Notes [Member] \| 4.875% Senior Notes Due 2020 and 5.375% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued				$ 1,500,000,000
Unamortized debt issuance costs	$ 13,865,000					$ 13,865,000
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued				$ 500,000,000
Interest rate (percent)	4.875%			4.875%		4.875%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member] \| Debt Instrument Redemption Period Prior to April 1, 2017 [Member]
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member] \| Maximum [Member] \| Debt Instrument Redemption Period Prior to April 1, 2017 [Member]
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount				1.00%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member] \| Treasury Rate [Member] \| Debt Instrument Redemption Period Prior to April 1, 2017 [Member]
Debt Instrument [Line Items]
Variable redemption price percentage				0.50%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member] \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt Instrument Redemption Period Prior to January 15, 2019 [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption	35.00%
Redemption price, percentage	105.875%
Senior notes indenture outstanding (percent)	65.00%
Senior Notes [Member] \| 4.875% Senior Notes due 2020 [Member] \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt Instrument Redemption Period Prior to April 1, 2016 [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption				35.00%
Redemption price, percentage				104.875%
Senior notes indenture outstanding (percent)				65.00%
Redemption period				90 days
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued				$ 1,000,000,000
Interest rate (percent)	5.375%			5.375%		5.375%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member] \| Debt Instrument Redemption Period Prior to April 1, 2018 [Member]
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member] \| Maximum [Member] \| Debt Instrument Redemption Period Prior to April 1, 2018 [Member]
Debt Instrument [Line Items]
Applicable premium as a percentage of principal amount				1.00%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member] \| Treasury Rate [Member] \| Debt Instrument Redemption Period Prior to April 1, 2018 [Member]
Debt Instrument [Line Items]
Variable redemption price percentage				0.50%
Senior Notes [Member] \| 5.375% Senior Notes due 2023 [Member] \| Redemption by Company of up to 35% of Aggregate Principal [Member] \| Debt Instrument Redemption Period Prior to April 1, 2016 [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount for redemption				35.00%
Redemption price, percentage				105.375%
Senior notes indenture outstanding (percent)				65.00%
Redemption period				90 days
Senior Notes [Member] \| 7.00% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal debt amount issued		750,000,000			750,000,000		750,000,000		$ 750,000,000
Interest rate (percent)									7.00%
Repayment of debt		866,861,000
Unamortized premium		93,965,000			93,965,000		93,965,000
Accrued and unpaid interest		$ 22,896,000			22,896,000		22,896,000
Loss on debt extinguishment					$ 103,273,000		$ 103,273,000