Floor on percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Represents the issue price of the debt instrument as a percentage of its face value.

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Basis points added to the reference rate related to Investment Grade Periods.

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Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be repurchased in the event of a change of control.

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Weighted average percentage discount on repurchases of debt.

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Represents the borrowing base under the credit facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility during an Investment Grade period.

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Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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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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Amount, after accumulated amortization, of debt discount (premium).

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Gross amount of debt extinguished.

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

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

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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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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Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Dec. 21, 2016	Mar. 17, 2015	Sep. 18, 2014	May 06, 2014	Nov. 05, 2013
Long- term Debt
Net unamortized premium	$ 600		$ 791
Net unamortized debt issuance costs	(16,433)		(19,464)
Long-term debt	3,707,787		3,758,868
Amount of debt repurchased	$ 383,000
Weighted average percentage discount on repurchases of debt	21.00%
Gain on extinguishment of debt repurchased	$ 80,561
Credit Facility
Long- term Debt
Long-term debt, gross	$ 882,000		552,000
Current borrowing base		$ 2,850,000
Lender commitments		$ 2,640,000
Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility	91 days
Outstanding balance	$ 882,000		$ 552,000
Weighted average interest rate (as a percent)	2.57%		3.28%
Outstanding letters of credit	$ 730,000		$ 623,000
Credit Facility \| Minimum \| Not Investment Grade Period
Long- term Debt
Basis points added to the reference rate	0.75%
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)	0.30%
Credit Facility \| Minimum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate	0.625%
Commitment fees on the unused portion during an Investment Grade period (as a percent)	0.15%
Credit Facility \| Maximum \| Not Investment Grade Period
Long- term Debt
Basis points added to the reference rate	2.75%
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)	0.375%
Credit Facility \| Maximum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate	2.25%
Commitment fees on the unused portion during an Investment Grade period (as a percent)	0.30%
Credit Facility \| NYFRB \| Not Investment Grade Period
Long- term Debt
Basis spread on variable rate (as a percent)	0.50%
Credit Facility \| LIBOR
Long- term Debt
Floor rate (as a percent)	1.00%
Credit Facility \| LIBOR \| Not Investment Grade Period
Long- term Debt
Basis spread on variable rate (as a percent)	1.00%
Credit Facility \| Alternate Base Rate
Long- term Debt
Floor rate (as a percent)	2.00%
5.375% senior notes due 2021
Long- term Debt
Long-term debt, gross	$ 730,283		952,500
Interest rate (as a percent)	5.375%							5.375%
Senior notes issued								$ 1,000,000
Issue price as percentage of par value								100.00%
Redemption price	100.00%
Redemption price at which notes may be required to be repurchased in event of change of control	101.00%
Stand-alone revolving note
Long- term Debt
Maximum amount of the Credit Facility	$ 25,000
Outstanding balance	$ 0		0
Stand-alone revolving note \| Lender's Prime Rate
Long- term Debt
Basis spread on variable rate (as a percent)	1.00%
5.125 senior notes due 2022
Long- term Debt
Long-term debt, gross	$ 761,337		923,041
Interest rate (as a percent)	5.125%						5.125%
Senior notes issued						$ 500,000	$ 600,000
Issue price as percentage of par value						100.50%	100.00%
Redemption price	101.281%
Redemption price at which notes may be required to be repurchased in event of change of control	101.00%
5.125 senior notes due 2022 \| On or after June 1, 2020
Long- term Debt
Redemption price	100.00%
5.625% senior notes due 2023
Long- term Debt
Long-term debt, gross	$ 750,000		750,000
Interest rate (as a percent)	5.625%				5.625%
Senior notes issued					$ 750,000
Issue price as percentage of par value					100.00%
Redemption price	102.813%
Redemption price at which notes may be required to be repurchased in event of change of control	101.00%
5.625% senior notes due 2023 \| On Or After June 1, 2021
Long- term Debt
Redemption price	100.00%
5.00% senior notes due 2025
Long- term Debt
Long-term debt, gross	$ 600,000		$ 600,000
Long-term notes payable				$ 600,000
Interest rate (as a percent)	5.00%			5.00%
Issue price as percentage of par value				100.00%
Redemption price at which notes may be required to be repurchased in event of change of control	101.00%
5.00% senior notes due 2025 \| On or after March 1, 2020
Long- term Debt
Redemption price	103.75%
5.00% senior notes due 2025 \| On or after March1, 2023
Long- term Debt
Redemption price	100.00%