Debt Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Repayments of Debt	$ 9,100	$ 109,000
Repayments of Other Debt	1,000	900
Notes Payable to Bank, Noncurrent	560,625		$ 568,750
Total debt	4,026,807		3,966,320
Current maturities of long-term debt	(63,863)		(65,016)
Less current maturities	63,863		65,016
Total long-term debt	$ 3,962,944		$ 3,901,304
Debt, Weighted Average Interest Rate	3.73%		3.70%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	78.00%		79.00%
Letters of Credit, Maximum Borrowing Capacity	$ 33,700
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	17,700	20,100
Unamortized Debt Issuance Expense	(43,747)		$ (45,100)
Bank credit facility	230,000		$ 155,000
Proceeds from Issuance of Debt	$ 75,000
Bank Facility Interest Rate	1.46%		1.11%
January 2022 [Member]
Debt Instrument [Line Items]
Bank credit facility	$ 230,000		$ 155,000
Term Loan December 2024 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 8,100
Unsecured Debt [Member] \| April 2027 [Member]
Debt Instrument [Line Items]
Senior Notes	152,710		152,710
Unsecured Debt [Member] \| December 2027 [Member]
Debt Instrument [Line Items]
Senior Notes	550,000		550,000
Unsecured Debt [Member] \| June 2029 [Member]
Debt Instrument [Line Items]
Senior Notes	750,000		750,000
Unsecured Debt [Member] \| August 2030
Debt Instrument [Line Items]
Senior Notes	850,000		850,000
Unsecured Debt [Member] \| May 2031
Debt Instrument [Line Items]
Senior Notes	800,000		800,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Finance Lease, Liability	130,039		136,847
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt, maturities through 2047	$ 47,180		$ 48,113

Bank Facility Interest Rate

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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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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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Weighted average interest rate of debt outstanding.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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- Definition

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, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt and lease obligation, classified as current.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The total amount due within more than 12 month, or the operating cycle if longer, on all notes payable to banks paid on an installment. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances.

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Amount of long-term notes payable classified as other.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Amount of cash outflow for the payment of debt classified as other.

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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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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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