Other Comprehensive Income Details 3 (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net earnings	$ 126,562	$ 98,115	$ 127,160	$ 111,805	$ 224,677	$ 238,965
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,096	$ (24,028)	(11,679)	$ 12,660	(21,932)	981
Comprehensive Income, Net of Tax (Note 9)	$ 128,658		$ 115,481		$ 202,745	$ 239,946