CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Successor [Member]	Sep. 30, 2012 Successor [Member]	Mar. 25, 2012 Predecessor [Member]	Sep. 30, 2011 Predecessor [Member]	Sep. 30, 2011 Predecessor [Member]
Net income (loss)	$ 16,986	$ (9,796)	$ 49,917	$ 58,032	$ 178,467
Other comprehensive income (loss), net of tax:
Change in fair value of interest rate hedges	0	0	3,878	(31,586)	(44,577)
Reclassification of unrealized loss on interest rate hedges into earnings	0	0	4,946	3,421	10,106
Change in fair value of commodity hedges	(3,534)	3,743	2,954	5,395	4,746
Reclassification of unrealized gain on commodity hedges into earnings	(3,845)	(7,386)	(1,307)	(3,581)	(9,455)
Reclassificcation of net actuarial loss and prior service credit relating to pension and other postretirement benefits into earnings	0	0	1,815	709	2,116
Change in other comprehensive income from equity investments	(291)	(93)	29	35	107
Other comprehensive income (loss), net of tax	(7,670)	(3,736)	12,315	(25,607)	(36,957)
Comprehensive income (loss)	$ 9,316	$ (13,532)	$ 62,232	$ 32,425	$ 141,510