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DEBT (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Long-Term Obligations
Consolidated Leverage Ratio		1.85	1.85
Consolidated Interest Coverage Ratio		15.31	15.31
Long-term obligations gross including current maturities		$ 1,215,731			$ 1,191,489
Current maturities of long-term obligations		(64,941)			(62,678)
Total long-term obligations		1,150,790			1,128,811
Deferred Finance Costs, Net, Total		2,529			2,818
Deferred debt issuance costs noncurrent		2,529			2,818
Long-term obligations including current maturities		1,213,202			1,188,671
Current maturities of long-term obligations		(64,941)		$ (65,309)	(62,678)
Long-term obligations, net of unamortized debt issuance costs		1,148,261		$ 1,129,238	1,125,993
Aggregate long-term maturities, excluding finance lease obligations
Year One		60,846
Year Two		62,141
Year Three		60,833
Year Four		134,848
Year Five		340,847
After Year Five		$ 527,958
Minimum
Long-Term Obligations
Consolidated Interest Coverage Ratio		3.00	3.00
Maximum
Long-Term Obligations
Consolidated Leverage Ratio		3.50	3.50
5-year revolving credit facility maturing in July 2022
Long-Term Obligations
Revolving credit facility maximum borrowing capacity		$ 300,000	€ 150.0
Amount outstanding under line of credit | €			€ 35.0			€ 69.0
Notes payable to banks
Long-Term Obligations
Proceeds from debt	$ 280,000
Long-term obligations gross including current maturities		224,000			224,000
Deferred Finance Costs, Net, Total		466			541
Long-term obligations including current maturities		$ 223,534			$ 223,459
Interest rate on notes (as a percent)	1.36%	1.36%	1.36%		1.36%	1.36%
Floating interest rate prior to conversion to a fixed interest rate		4.10%	4.10%		4.00%	4.00%
Notes payable 0.00% - 11.00%, due in monthly and annual installments through 2028
Long-Term Obligations
Long-term obligations gross including current maturities		$ 22,328			$ 15,531
Long-term obligations including current maturities		$ 22,328			$ 15,531
Notes payable 0.00% - 11.00%, due in monthly and annual installments through 2028 | Minimum
Long-Term Obligations
Interest rate on notes (as a percent)		0.00%	0.00%		0.00%	0.00%
Notes payable 0.00% - 11.00%, due in monthly and annual installments through 2028 | Maximum
Long-Term Obligations
Interest rate on notes (as a percent)		11.00%	11.00%		16.00%	16.00%
Senior unsecured notes 3.2%, due in 2022
Long-Term Obligations
Long-term obligations gross including current maturities		$ 75,000			$ 75,000
Deferred Finance Costs, Net, Total		76			88
Long-term obligations including current maturities		$ 74,924			$ 74,912
Interest rate on notes (as a percent)		3.20%	3.20%		3.20%	3.20%
Senior unsecured notes 3.5%, due in 2023
Long-Term Obligations
Long-term obligations gross including current maturities		$ 125,000			$ 125,000
Deferred Finance Costs, Net, Total		162			181
Long-term obligations including current maturities		$ 124,838			$ 124,819
Interest rate on notes (as a percent)		3.50%	3.50%		3.50%	3.50%
Senior unsecured notes 0.98%, due in 2023
Long-Term Obligations
Long-term obligations gross including current maturities		$ 113,715			$ 114,535
Deferred Finance Costs, Net, Total		385			432
Long-term obligations including current maturities		$ 113,330			$ 114,103
Interest rate on notes (as a percent)		1.00%	1.00%		1.00%	1.00%
Senior unsecured notes 3.4%, due in 2024
Long-Term Obligations
Long-term obligations gross including current maturities		$ 50,000			$ 50,000
Deferred Finance Costs, Net, Total		70			76
Long-term obligations including current maturities		$ 49,930			$ 49,924
Interest rate on notes (as a percent)		3.40%	3.40%		3.40%	3.40%
Senior unsecured notes 3.5%, due in 2024
Long-Term Obligations
Long-term obligations gross including current maturities		$ 100,000			$ 100,000
Deferred Finance Costs, Net, Total		162			181
Long-term obligations including current maturities		$ 99,838			$ 99,819
Interest rate on notes (as a percent)		3.50%	3.50%		3.50%	3.50%
Senior unsecured notes 1.17%, due in 2024
Long-Term Obligations
Long-term obligations gross including current maturities		$ 227,430			$ 229,070
Deferred Finance Costs, Net, Total		823			904
Long-term obligations including current maturities		$ 226,607			$ 228,166
Interest rate on notes (as a percent)		1.20%	1.20%		1.20%	1.20%
Senior unsecured notes 3.6%, due in 2025
Long-Term Obligations
Long-term obligations gross including current maturities		$ 125,000			$ 125,000
Deferred Finance Costs, Net, Total		193			207
Long-term obligations including current maturities		$ 124,807			$ 124,793
Interest rate on notes (as a percent)		3.60%	3.60%		3.60%	3.60%
Senior unsecured notes 3.6%, due in 2026
Long-Term Obligations
Long-term obligations gross including current maturities		$ 125,000			$ 125,000
Deferred Finance Costs, Net, Total		192			208
Long-term obligations including current maturities		$ 124,808			$ 124,792
Interest rate on notes (as a percent)		3.60%	3.60%		3.60%	3.60%
Financial lease liabilities
Long-Term Obligations
Long-term obligations gross including current maturities		$ 28,258
Long-term obligations including current maturities		$ 28,258
Capital lease obligations
Long-Term Obligations
Long-term obligations gross including current maturities					$ 8,353
Long-term obligations including current maturities					$ 8,353

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