Benefits 1 (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended						6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Successor [Member]	Jun. 30, 2012 Successor [Member]		Mar. 25, 2012 Predecessor [Member]		Jun. 30, 2011 Predecessor [Member]	Jun. 30, 2011 Predecessor [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0	$ 0		$ 624		$ 638	$ 1,275
Interest cost		215	233		836		950	1,900
Expected return on plan assets		(1,107)	(1,199)		(918)		(950)	(1,900)
Prior service credit amortization		0	0		(472)		(522)	(1,044)
Actuarial loss amortization			0		298			0
Curtailment recognition	10,500		(10,527)	[1]	0	[1]		0	[1]
Net periodic benefit cost		$ (892)	$ (11,493)		$ 368		$ 116	$ 231

[1] Subsequent to the Merger, the Company amended certain of its other postretirement employee benefit plans to prospectively restrict participation in the plans for certain active employees. The plan amendments resulted in the plans becoming currently over-funded and, accordingly, the Company recorded a gross pre-tax curtailment gain of $69.8 million, $59.3 million of which is subject to refund to customers; thus, the net curtailment gain recognition was $10.5 million.