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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)	1 Months Ended
	Jul. 31, 2018	Dec. 31, 2013	Dec. 31, 2010	Jun. 30, 2019	Dec. 31, 2018	Jul. 02, 2018
Debt Instrument [Line Items]
Effective interest rate				5.11%
Finance lease obligations				$ 17,066,000	$ 17,587,000
Debt issuance costs				(4,696,000)	(5,256,000)
Total debt, finance lease obligations, and notes payable				1,898,068,000	1,962,570,000
Less: current maturities				66,505,000	66,543,000
Total long-term debt, finance lease obligations, and notes payable				$ 1,831,563,000	1,896,027,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				2.97%
Senior Notes \| Senior Unsecured Notes 3.81% Due May 2018
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 25,000,000
Senior Notes \| Senior Unsecured Notes 4.60% Due May 2021
Debt Instrument [Line Items]
Stated interest rate				4.60%
Proceeds from Issuance of Debt			$ 75,000,000
Long-term debt				$ 75,000,000	75,000,000
Senior Notes \| Senior Unsecured Notes 3.13% Due December 2020
Debt Instrument [Line Items]
Stated interest rate				3.13%
Proceeds from Issuance of Debt		$ 100,000,000
Long-term debt				$ 100,000,000	100,000,000
Senior Notes \| Senior Unsecured Notes 4.23% Due July 2028
Debt Instrument [Line Items]
Stated interest rate				4.23%		4.23%
Proceeds from Issuance of Debt	$ 350,000,000
Long-term debt					350,000,000
Notes payable and other
Debt Instrument [Line Items]
Stated interest rate				4.24%
Long-term debt				$ 86,399,000	87,608,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving loan facility				$ 154,299,000	187,631,000
Term loan
Debt Instrument [Line Items]
Average interest rate at June 30, 2019				3.90%
Revolving loan facility				$ 1,120,000,000	$ 1,150,000,000