Other Comprehensive Income Details 3 (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net earnings	$ 129,395	$ 127,160	$ 111,805	$ 126,653	$ 111,468	$ 93,304	$ 368,360	$ 331,425
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(13,553)	$ (11,679)	$ 12,660	(17,808)	$ (29,205)	$ 28,890	(12,572)	(18,123)
Comprehensive Income, Net of Tax (Note 10)	$ 115,842			$ 108,845			$ 355,788	$ 313,302