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Long-Term Debt Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,574,204	$ 1,659,011
Less current maturities	139,590	217,234
Long-term debt and capital leases, net of current maturities and related costs	1,434,614	1,441,777
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 634,761	$ 525,240
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.70%	5.70%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 939,443	$ 1,133,771
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.40%	2.40%

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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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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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