Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
NET EARNINGS	$ 6,914	$ 11,059	$ 15,414	$ 17,491
OTHER COMPREHENSIVE INCOME (LOSS):
Gains and Losses on Derivatives	(8)	(9)	(16)	(18)
TOTAL OTHER COMPREHENSIVE INCOME	1,116	867	2,232	1,734
TOTAL COMPREHENSIVE INCOME	8,030	11,926	17,646	19,225
Pension Plans [Member]
OTHER COMPREHENSIVE INCOME (LOSS):
Defined Benefit Pension and Post-Retirement	1,958	1,682	3,916	3,364
Post-Retirement Plans [Member]
OTHER COMPREHENSIVE INCOME (LOSS):
Defined Benefit Pension and Post-Retirement	$ (834)	$ (806)	$ (1,668)	$ (1,612)