CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 9,174		$ 5,194
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(812)		1,069
Amortization of:
Prior service benefit	(1,080)	[1]	(1,196)
Unrecognized loss	785	[1]	713
Foreign currency exchange rate changes	(12)		16
Income tax benefit related to pension and postretirement plans	108		186
Pension and post retirement plans, net of tax	(199)		(281)
Total other comprehensive income (loss), net of tax	(1,011)		788
Comprehensive income	$ 8,163		$ 5,982

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs, which are included in selling, general and administrative expenses in our consolidated statements of operations (see Note 11 for additional details).