Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
NET EARNINGS	$ 10,784	$ 9,509	$ 19,893	$ 16,242
Other comprehensive income (loss), net of tax	2	(7)	(4)	(14)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	144	0	(296)	0
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	43	4	46	8
TOTAL COMPREHENSIVE INCOME, net of tax	12,032	8,998	21,797	15,219
Pension Plans [Member]
Other comprehensive income (loss), net of tax	1,142	0	2,284	(1)
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	(651)	0	(1,302)	0
Post-Retirement Plans [Member]
Other comprehensive income (loss), net of tax	(40)	(504)	(80)	(1,008)
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	$ 23	$ 288	$ 46	$ 576