Correction of Previously Issued Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Consolidated Statement of Comprehensive (Loss) Income
General and administrative expenses	$ 722	$ 1,489	$ 1,774	$ 4,434
Pension and other postretirement expense	266	285	532	598
(Gain) loss on asset dispositions	(31)	(13)	(234)	(1,376)
Pension, net of income taxes of $0	185	207	370	423
Income taxes	0		0
Comprehensive (loss) income	(849)	(2,255)	(908)	10,386
Consolidated Statement of Stockholders' Deficiency
Other comprehensive income-pension	185	207	370	423
Accumulated other comprehensive loss	(23,199)	(16,471)	(23,199)	(16,471)	(23,569)
As Previously Reported
Consolidated Statement of Comprehensive (Loss) Income
General and administrative expenses		1,867		3,568
(Gain) loss on asset dispositions				193
Comprehensive (loss) income		(2,462)		9,963
Consolidated Statement of Stockholders' Deficiency
Accumulated other comprehensive loss		(16,894)		(16,894)
Adjustments | Reclassifications
Consolidated Statement of Comprehensive (Loss) Income
General and administrative expenses		(378)		(681)
Pension and other postretirement expense		285		598
(Gain) loss on asset dispositions		(13)		(22)
Adjustments | Corrections of Error
Consolidated Statement of Comprehensive (Loss) Income
General and administrative expenses				1,547
(Gain) loss on asset dispositions				(1,547)
Pension, net of income taxes of $0		207		423
Comprehensive (loss) income		207		423
Consolidated Statement of Stockholders' Deficiency
Other comprehensive income-pension		207		423
Accumulated other comprehensive loss		$ 423		$ 423