Other Comprehensive Income Details 3 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Net earnings	$ 74,022	$ 69,062	$ 132,073	$ 121,606	$ 306,094
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(2,391)	5,835	(537)	(11,280)	62,425
Comprehensive Income, Net of Tax (Note 8)	$ 71,631	$ 74,897	$ 131,536	$ 110,326