Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current [Abstract]
Federal	$ (10,282)	$ (4,336)	$ 350
State	(1,176)	(1,187)	(721)
Current income tax (provision) benefit	(11,458)	(5,523)	(371)
Deferred [Abstract]
Federal	(4,940)	(7,407)	(3,688)
State	(438)	99	(11)
Deferred income tax (provision) benefit	(5,378)	(7,308)	(3,699)
Income tax (provision) benefit	(16,836)	(12,831)	(4,070)
Income tax expense (benefit), continuing and discontinued operations [Abstract]
From continuing operations	(16,697)	(13,107)	(4,028)
From discontinued operations	(139)	276	(42)
Income tax (provision) benefit	(16,836)	(12,831)	(4,070)
Reconciliation of taxes computed at the corporate federal income tax rate to the reported income tax (provision) [Abstract]
Statutory federal income tax (provision) benefit	(15,619)	(12,517)	(4,445)
State income tax (provision) benefit	(1,049)	(707)	(476)
Federal statutory depletion	36	393	534
Foreign investment write-off	0	0	201
Other	(204)	0	116
Income tax (provision) benefit	(16,836)	(12,831)	(4,070)
Current deferred tax asset (liability) [Abstract]
Allowance for doubtful accounts	581	772
Prepaid insurance	(815)	(793)
Fair value contracts	(6)	(484)
Net current deferred liability	(240)	(505)
Long-term deferred tax asset (liability) [Abstract]
Property	(15,957)	(10,579)
Uniform capitalization	552	471
Other	(221)	160
Net long-term deferred tax liability	(15,626)	(9,948)
Net deferred tax liability	$ (15,866)	$ (10,453)
Federal [Member]
Income Tax Examination [Line Items]
Earliest Open Tax Year	2009
Texas [Member]
Income Tax Examination [Line Items]
Earliest Open Tax Year	2008
Louisiana [Member]
Income Tax Examination [Line Items]
Earliest Open Tax Year	2009
Michigan [Member]
Income Tax Examination [Line Items]
Earliest Open Tax Year	2009