Cash Interest Payments, Expected Payments in Year Five

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Cash Interest Payments, Expected Payments in Year Four

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Cash Interest Payments, Expected Payments in Year One

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Cash Interest Payments, Expected Payments in Year Six and Thereafter

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Cash Interest Payments, Expected Payments in Year Three

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Cash Interest Payments, Expected Payments in Year Two

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Cash Interest Payments Expected Payments Total

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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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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Weighted average interest rate of debt outstanding.

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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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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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

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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 of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

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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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Debt Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
Debt Level 4 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal payments on capital leases	$ 42,627	$ 39,686	$ 51,106
Repayments of Debt	1,200,000	293,700
Repayments of Long-term Debt	25,471	34,134	468,973
Repayments of Other Debt	300	300
Losses on early extinguishment of debt, net	(16,637)	(10,131)	(274)
Total debt	3,583,351	3,602,078
Current maturities of long-term debt	(69,821)	(69,896)
Less current maturities	69,821	69,896
Total long-term debt	$ 3,513,530	$ 3,532,182
Debt, Weighted Average Interest Rate	4.72%	4.99%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	69.00%	66.00%
Next Twelve Months	$ 73,912
Year Two	244,931
Year Three	60,322
Year Four	69,898
Year Five	1,659,084
After Year Five	1,504,424
Long-term Debt, Gross	3,612,571
Letters of Credit, Maximum Borrowing Capacity	34,000	$ 32,900
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	190,672	179,865	$ 160,843
Payments in 2020	169,519
Payments in 2021	166,382
Payments in 2022	154,506
Payments in 2023	153,727
Payments in 2024	108,640
Payments in 2025 and thereafter	274,871
Cash Interest Payments Expected Payments Total	1,027,645
Unamortized Debt Issuance Expense	(34,854)	(31,762)
October 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt		250,000
November 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt	200,000
January 2022 [Member]
Debt Instrument [Line Items]
Repayments of Debt	425,000
Bank credit facility	295,000	0
April 2027 [Member]
Debt Instrument [Line Items]
Repayments of Debt	46,500
May 2024 [Member]
Debt Instrument [Line Items]
Bank credit facility	295,000
Bank Credit Facility due March 2022 [Member]
Debt Instrument [Line Items]
Repayments of Debt	450,000
Bank credit facility	0	395,000
Term Loan December 2022 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt		33,800
Repayments of Other Debt	32,100
Notes Payable to Bank, Noncurrent	0	641,250
December 2022 [Member]
Debt Instrument [Line Items]
Notes Payable to Bank, Noncurrent	633,750	0
Bank credit facility	295,000	0
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unamortized pricing discounts and other	5,634	6,562
Unsecured Debt [Member] \| November 2020 [Member]
Debt Instrument [Line Items]
Senior Notes	0	200,000
Unsecured Debt [Member] \| November 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	150,000	150,000
Unsecured Debt [Member] \| January 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	0	425,000
Unsecured Debt [Member] \| April 2027 [Member]
Debt Instrument [Line Items]
Senior Notes	153,465	200,000
Unsecured Debt [Member] \| May 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	850,000	850,000
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	0
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Obligations under capital leases	185,252	211,952
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt, maturities through 2047	$ 45,104	$ 4,076