ACCUMULATED OTHER COMPREHENSIVE INCOME LOSS ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclass) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Earnings before income taxes										$ 356,239	$ 299,619	$ 267,961
Provision for income taxes										(80,490)	(84,728)	(78,579)
Net earnings		$ 82,835	$ 74,483	$ 74,788	$ 43,643	$ 67,750	$ 63,944	$ 50,650	$ 32,547	275,749	214,891	$ 187,329
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	[1]									908	756
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	[1]									(16,736)	(12,702)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Curtailments, before Tax										(337)	(327)
Earnings before income taxes										(16,165)	(12,273)
Provision for income taxes										3,952	4,468
Net earnings										$ (12,213)	$ (7,805)

[1] These items are included in the computation of net periodic pension cost. See Note 16, Pension and Other Postretirement Benefit Plans.