Comprehensive Income (Loss) 2 (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Successor [Member]	Dec. 31, 2011 Predecessor [Member]
Comprehensive Income Loss [Line Items]
Interest rate hedges, net	$ 0	$ (50,259)
Commodity hedges, net	3,736	(11)
Benefit plans:
Net actuarial loss and prior service costs, net - pensions	0	(51,845)
Net actuarial gain and prior service credit, net - OPEB	0	(14,542)
Equity investments, net	198	(2,535)
Total accumulated other comprehensive income (loss), net of tax	$ 3,934	$ (119,192)