STATEMENT OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
STATEMENT OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net earnings	$ 10,894	$ 12,401
Other comprehensive income [Abstract]
Foreign currency translation adjustments	10,352	2,685
Defined benefit pension plans [Abstract]
Defined benefit pension plans, amortization of prior service cost included in net periodic benefit cost	232	236
Amortization of unrecognized net loss included in net periodic benefit cost	2,203	909
Income tax (expense) related to defined benefit pension plans	(898)	(424)
Total defined benefit pension plans	1,537	721
Defined benefit postretirement plans [Abstract]
Defined benefit postretirement plans, amortization of prior service cost included in net periodic benefit cost	13	13
Defined benefit postretirement plans, amortization of unrecognized net gain included in net periodic benefit cost	(45)	(61)
Income tax benefit related to defined benefit postretirement plans	12	18
Total defined benefit postretirement plans	(20)	(30)
Total other comprehensive income	11,869	3,376
Total comprehensive income	$ 22,763	$ 15,777