Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income	$ 28,863	$ 27,622	$ 26,056
Employee Benefits, net of tax:
Amortization of prior service cost, net of tax of ($26), $432 and $5, respectively	(37)	645	8
Net Gain, net of tax of ($331), ($1,164) and ($541), respectively	(498)	(1,812)	(844)
Total other comprehensive loss	(535)	(1,167)	(836)
Comprehensive Income	$ 28,328	$ 26,455	$ 25,220