Condensed Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net earnings	$ 21,267	$ 64,030	$ 125,128	$ 151,815
Other comprehensive income (loss)
Foreign currency translation adjustments, net of tax of $(251) and $162, $(240) and $(872) for the three and nine months ended September 30, 2021 and 2020, respectively	(251)	162	(240)	(872)
Total other comprehensive (loss) income	(944)	609	(901)	(3,280)
Comprehensive income	20,323	64,639	124,227	148,535
Accumulated Other comprehensive Loss [Member]
Other comprehensive income (loss)
Total other comprehensive (loss) income	$ (944)	$ 609	$ (901)	$ (3,280)