Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
NET EARNINGS	$ 9,109	$ 6,733
Other comprehensive income (loss), net of tax	(6)	(7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(440)	0
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	3	4
TOTAL COMPREHENSIVE INCOME, net of tax	9,765	6,221
Pension Plans [Member]
Other comprehensive income (loss), net of tax	1,142	(1)
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	(651)	0
Post-Retirement Plans [Member]
Other comprehensive income (loss), net of tax	(40)	(504)
OTHER COMPREHENSIVE INCOME (LOSS):
Income tax (expense) or benefit	$ 23	$ 288