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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jul. 02, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Effective interest rate	5.25%
Capital lease obligations	$ 18,052		$ 19,889
Debt issuance costs	(5,356)		(2,261)
Total debt, capital lease obligations, and notes payable	1,864,327		913,012
Less: current maturities	66,595		47,746
Total long-term debt, capital lease obligations, and notes payable	$ 1,797,732		865,266
Revolving Credit Facility
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.84%
Senior Notes \| Senior Unsecured Notes 3.81% Due May 2018
Debt Instrument [Line Items]
Stated interest rate	3.81%
Long-term debt	$ 0		25,000
Senior Notes \| Senior Unsecured Notes 4.60% Due May 2021
Debt Instrument [Line Items]
Stated interest rate	4.60%
Long-term debt	$ 75,000		75,000
Senior Notes \| Senior Unsecured Notes 3.13% Due December 2020
Debt Instrument [Line Items]
Stated interest rate	3.13%
Long-term debt	$ 100,000		100,000
Senior Notes \| Senior Unsecured Notes 4.23% Due July 2028
Debt Instrument [Line Items]
Stated interest rate	4.23%	4.23%
Long-term debt	$ 350,000		0
Notes payable and other
Debt Instrument [Line Items]
Stated interest rate	4.23%
Long-term debt	$ 87,608		12,384
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving loan facility	$ 74,023		3,000
Term loan
Debt Instrument [Line Items]
Average interest rate at September 30, 2018	3.77%
Revolving loan facility	$ 1,165,000		$ 680,000