Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2011

Accumulated Other Comprehensive Income

Schedule of components of accumulated other comprehensive income, net of tax

	December 31,
	2011	2010
	(Thousands)
Net unrealized gain from natural gas hedging transactions	$   232,066	$65,226
Net unrealized loss from interest rate swaps	(7,645)	(212)
Unrealized gain on available-for-sale securities	–	4,896
Pension and other post-retirement benefits liability adjustment	(36,280)	(31,806)
Accumulated other comprehensive income	$   188,141	$   38,104