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
NET EARNINGS	$ 9,907	$ 7,799	$ 26,149	$ 23,213
Other comprehensive income (loss), net of tax	(6)	(7)	(20)	(23)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(938)	0	(938)	0
TOTAL COMPREHENSIVE INCOME, net of tax	8,458	8,916	23,677	26,562
Pension Plans [Member]
Other comprehensive income (loss), net of tax	(1)	1,958	(2)	5,874
Post-Retirement Plans [Member]
Other comprehensive income (loss), net of tax	$ (504)	$ (834)	$ (1,512)	$ (2,502)