Other Comprehensive Income Details 3 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Net earnings	$ 101,332	$ 88,861	$ 246,594	$ 229,469	$ 352,820
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	16,372	(40,613)	246	(25,089)	$ (53,700)
Comprehensive Income, Net of Tax (Note 9)	$ 117,704	$ 48,248	$ 246,840	$ 204,380