Other Comprehensive Income Details 3 (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Net earnings	$ 127,160	$ 111,805	$ 111,468	$ 93,304	$ 238,965	$ 204,772
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(11,679)	$ 12,660	(29,205)	$ 28,890	981	(315)
Comprehensive Income, Net of Tax (Note 10)	$ 115,481		$ 82,263		$ 239,946	$ 204,457