Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$ 3,180	$ 3,879	$ 25,995	$ 23,104
Employee Benefits, net of tax:
Amortization of prior service cost, net of tax of ($6), ($6), ($18), and ($18) respectively	9	9	26	27
Net gain, net of tax of $27, $43, $80 and $124, respectively	39	64	118	186
Commodity Contract Cash Flow Hedges [Abstract]
Unrealized loss on commodity contract cash flow hedges, net of tax of ($18), $0, ($19) and $0, respectively.	(27)		(28)
Total other comprehensive income	3	55	64	159
Comprehensive Income	$ 3,183	$ 3,934	$ 26,059	$ 23,263