Comprehensive Income (Loss) 1 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012 Successor [Member]	Jun. 30, 2012 Successor [Member]	Mar. 25, 2012 Predecessor [Member]	Jun. 30, 2011 Predecessor [Member]	Jun. 30, 2012 Predecessor [Member]
Income taxes included in other comprehensive income:
Reclassification of unrealized loss on interest rate hedges into earnings	$ 0	$ 0	$ 1,700	$ 2,190	$ 4,354
Change in fair value of interest rate hedges	0	0	0	(244)	(531)
Reclassification of prior service credit relating to other postretirement benefits into earnings	0	0	14	(143)	(287)
Income tax benefit included in other comprehensive income	$ 0	$ 0	$ 1,714	$ 1,803	$ 3,536