STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net Income (Loss)	$ 1,626	$ 2,294
Interest rate swaps:
Changes in designated interest rate swaps	(5)	0
Income tax (expense) benefit	2	0
Unrealized holding gains (loss) on interest rate swaps	(3)	0
Amount Included In Net Periodic Benefit Cost [Abstract]
Net actuarial loss	120	135
Prior service credit	(236)	(19)
Transition asset	0	15
Income tax expense (benefit)	46	(52)
Change in post-retirement benefit plan	(70)	79
Other comprehensive income (loss)	(73)	79
Comprehensive Income	$ 1,553	$ 2,373