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Financing Agreement - Debt Instruments (Details) - USD ($)	Dec. 31, 2018	Jul. 02, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 1,862,631,000		$ 883,000,000	$ 1,112,142,000
Interest rate at December 31	3.64%		2.91%	2.25%
Debt issuance costs	$ (5,256,000)		$ (2,261,000)
Total debt, capital lease obligations, and notes payable	1,962,570,000		913,012,000
Less: current maturities	66,543,000		47,746,000
Total long-term debt, capital lease obligations, and notes payable	$ 1,896,027,000		865,266,000
Revolving loan facility
Debt Instrument [Line Items]
Average interest rate	2.88%
Long-term debt	$ 187,631,000		3,000,000
Senior Notes \| Senior Unsecured Notes, 3.81 Percent, Due May 2018
Debt Instrument [Line Items]
Long-term debt	$ 0		25,000,000
Interest rate, stated percentage	3.81%
Senior Notes \| Senior Unsecured Notes, 4.60 Percent, Due May 2021
Debt Instrument [Line Items]
Long-term debt	$ 75,000,000		75,000,000
Interest rate, stated percentage	4.60%
Senior Notes \| Senior Unsecured Notes 3.13 Percent Due December 2020
Debt Instrument [Line Items]
Long-term debt	$ 100,000,000		100,000,000
Interest rate, stated percentage	3.13%
Senior Notes \| Senior Unsecured Notes 4.23 Percent, Due July 2028
Debt Instrument [Line Items]
Long-term debt	$ 350,000,000		0
Interest rate, stated percentage	4.23%	4.23%
Capital lease obligations
Debt Instrument [Line Items]
Interest rate at December 31	5.28%
Capital lease obligations	$ 17,587,000		19,889,000
Notes payable and other
Debt Instrument [Line Items]
Interest rate, stated percentage	4.23%
Notes payable and other \| Notes Payable 3.50 Percent Due June 2027
Debt Instrument [Line Items]
Long-term debt	$ 87,608,000		12,384,000
Long-term Debt
Debt Instrument [Line Items]
Interest rate at period end	3.76%
Long-term line of credit	$ 1,150,000,000		$ 680,000,000