Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net earnings	$ 561,109	$ 512,611	$ 375,972
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2,898	(32,573)	83,982
Unrealized gains (losses) on cash flow hedging arrangements:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1,063)	(658)	1,424
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(861)	2,441	(273)
Net actuarial gains (losses)	(32,699)	(23,326)	(10,378)
Plan amendments and prior service cost	430	(780)	12,056
Amortization of actuarial (gains) losses and plan amendments and prior service cost	12,144	14,366	14,873
Defined Benefit Plans, Impact of FX on Current Year Change in OCI, net of tax	(2,108)	3,522	(12,092)
Total other comprehensive income (loss), net of tax	(21,259)	(37,008)	89,592
Total other comprehensive income (loss), net of tax	$ 539,850	$ 475,603	$ 465,564