Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Notes to Financial Statements [Abstract]

Schedule of Derivative Instruments

The effect of derivative instruments in cash flow hedging relationships on the Consolidated Statements of Income and the Consolidated Statements of Stockholders' Equity were as follows:

	Three Months Ended March 31,
	2013			2012
Natural Gas Price Swaps
Beginning Balance – Accumulated OCI	$	76,761		$	151,780
Gain/(Loss) recognized in Accumulated OCI	$	(18,595	)	$	76,076
Less: Gain reclassified from Accumulated OCI into Outside Sales	$	22,713		$	47,941
Ending Balance – Accumulated OCI	$	35,453		$	179,915
Gain/(Loss) recognized in Outside Sales for ineffectiveness	$	1,041		$	(835	)

There were no amounts excluded from the assessment of hedge effectiveness in 2013 or 2012.