Comprehensive Income (Loss) 1 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Successor	Sep. 30, 2012 Successor	Mar. 25, 2012 Predecessor	Sep. 30, 2011 Predecessor	Sep. 30, 2011 Predecessor
Income taxes included in other comprehensive income:
Reclassification of unrealized loss on interest rate hedges into earnings	$ 0	$ 0	$ 1,700	$ 2,230	$ 6,584
Change in fair value of interest rate hedges	0	0	0	20	(511)
Reclassification of prior service credit relating to other postretirement benefits into earnings	0	0	14	(144)	(431)
Income tax benefit included in other comprehensive income	$ 0	$ 0	$ 1,714	$ 2,106	$ 5,642