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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Jul. 02, 2018
Debt Instrument [Line Items]
Effective interest rate	5.08%
Finance lease obligations	$ 17,219	$ 17,587
Debt issuance costs	(4,976)	(5,256)
Total debt, finance lease obligations, and notes payable	2,101,282	1,962,570
Less: current maturities	66,512	66,543
Total long-term debt, finance lease obligations, and notes payable	$ 2,034,770	1,896,027
Revolving Credit Facility
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.16%
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	350,000
Notes payable and other
Debt Instrument [Line Items]
Stated interest rate	4.24%
Long-term debt	$ 86,399	87,608
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving loan facility	$ 342,640	187,631
Term loan
Debt Instrument [Line Items]
Average interest rate at March 31, 2019	3.75%
Revolving loan facility	$ 1,135,000	$ 1,150,000