Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net Earnings	$ 40,231	$ 41,584	$ 32,713
Other Comprehensive (Loss) Income:
Foreign currency translation adjustments	(2,242)	574	(3,125)
Pension and retiree medical benefits	12,282	(2,534)	(6,192)
Income Taxes:
Foreign currency translation adjustments	(15)	(25)	0
Pension and retiree medical benefits	(4,663)	889	2,354
Total Other Comprehensive Income (Loss), net of tax	5,362	(1,096)	(6,963)
Comprehensive Income	$ 45,593	$ 40,488	$ 25,750