Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 10,231	$ 9,049	$ 23,677	$ 18,237
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,203)	610	(1,137)	242
Employee benefit funded status adjustment, net of tax	567	166	836	968
Comprehensive income	$ 9,595	$ 9,825	$ 23,376	$ 19,447