Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net earnings	$ 92,663	$ 84,021	$ 173,273	$ 160,743
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $5,938 and $6,257 for the three months ended June 30, 2013 and 2012, and $11,416 and $758 for the six months ended June 30, 2013 and 2012	(11,013)	(11,453)	(21,026)	(1,291)
Other comprehensive loss	(11,013)	(11,453)	(21,026)	(1,291)
Comprehensive income	81,650	72,568	152,247	159,452
Less comprehensive income attributable to the noncontrolling interest	175	22	456	171
Comprehensive income attributable to shareholders	$ 81,475	$ 72,546	$ 151,791	$ 159,281