CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 11,725	$ 9,174
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(590)	(812)
Amortization of:
Prior service benefit	(754)	(1,080)
Unrecognized loss	592	785
Foreign currency exchange rate changes	(22)	(12)
Income tax benefit related to pension and postretirement plans	58	108
Pension and post retirement plans, net of tax	(126)	(199)
Total other comprehensive income (loss), net of tax	(716)	(1,011)
Comprehensive income	$ 11,009	$ 8,163