Other Comprehensive Income Details 3 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Net earnings	$ 69,062	$ 61,704	$ 121,606	$ 114,031	$ 290,847
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,835	(24,735)	(11,280)	(3,944)	(10,523)
Comprehensive Income, Net of Tax	$ 74,897	$ 36,969	$ 110,326	$ 110,087