Other Comprehensive Income Details 3 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Net earnings	$ 79,588	$ 77,557	$ 145,262	$ 140,608	$ 352,820
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(22,958)	21,780	(16,126)	15,524	$ (53,700)
Comprehensive Income, Net of Tax (Note 9)	$ 56,630	$ 99,337	$ 129,136	$ 156,132