Debt Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Principal payments on capital leases	$ 43,598	$ 42,627	$ 39,686
Repayments of Debt	1,200,000	1,400,000
Repayments of Long-term Debt	34,489	25,471	34,134
Repayments of Other Debt	2,000	300
Losses on early extinguishment of debt, net	18,428	16,637	10,131
Obligations under capital leases	148,864	185,252
Other Notes Payable	51,766	45,104
Total debt	3,742,534	3,583,351
Current maturities of long-term debt	(228,352)	(69,821)
Less current maturities	228,352	69,821
Total long-term debt	$ 3,514,182	$ 3,513,530
Debt, Weighted Average Interest Rate	3.62%	4.72%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	66.00%	69.00%
Next Twelve Months	$ 228,355
Year Two	60,752
Year Three	70,152
Year Four	1,038,963
Year Five	38,823
After Year Five	2,305,489
Long-term Debt, Gross	3,742,534
Letters of Credit, Maximum Borrowing Capacity	34,000	$ 34,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	152,524	190,672	$ 179,865
Payments in 2021	135,299
Payments in 2022	123,677
Payments in 2023	122,791
Payments in 2024	112,518
Payments in 2025	105,164
Payments in 2026 and thereafter	331,096
Cash Interest Payments Expected Payments Total	930,545
Unamortized Debt Issuance Expense	(36,739)	(34,854)
Bank credit facility	525,000	295,000
Proceeds from Issuance of Debt	1,600,000	1,100,000
Repayments of Lines of Credit	505,000
Redemption Premium	16,100	11,500
Pledged Assets Separately Reported, Finance Receivables Pledged as Collateral, at Fair Value	2,000	2,700
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	1,200	600
Repayments of Lines of Credit	505,000
Redemption Premium	16,100	11,500
Pledged Assets Separately Reported, Finance Receivables Pledged as Collateral, at Fair Value	2,000	2,700
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position	1,200	600
November 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt	200,000
January 2022 [Member]
Debt Instrument [Line Items]
Repayments of Debt	425,000
April 2027 [Member]
Debt Instrument [Line Items]
Repayments of Debt	800	46,500
May 2024 [Member]
Debt Instrument [Line Items]
Repayments of Debt	850,000
Notes Payable to Bank, Noncurrent	601,250
Bank credit facility	525,000	295,000
Debt Instrument, Periodic Payment	32,500	16,300
Debt Instrument, Periodic Payment	32,500	16,300
Bank Credit Facility due March 2022 [Member]
Debt Instrument [Line Items]
Repayments of Lines of Credit	450,000
Repayments of Lines of Credit	450,000
Term Loan December 2022 [Member]
Debt Instrument [Line Items]
Repayments of Other Debt	32,100
Notes Payable to Bank, Noncurrent		633,750
Debt Instrument, Periodic Payment	8,500
Debt Instrument, Periodic Payment	8,500
June 2029 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		750,000
August 2030 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	850,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unamortized pricing discounts and other	(317)	5,634
Unsecured Debt [Member] \| November 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	150,000	150,000
Unsecured Debt [Member] \| April 2027 [Member]
Debt Instrument [Line Items]
Senior Notes	152,710	153,465
Unsecured Debt [Member] \| May 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	0	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	750,000
Unsecured Debt [Member] \| August 2030 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 850,000	$ 0

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