Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Statements of Operations (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 74,952	$ 193,814
Costs and expenses:
Operating Costs	52,289	131,064
Depreciation and amortization	29,824	41,782
General and administrative	16,508	21,860
Bad debt expense (recovery)	(55)	319
Loss (gain) on dispositions of property and equipment	(600)	1,133
Impairment charges	0	5,990
Intercompany leasing	0	0
Total costs and expenses	97,966	202,148
Income (loss) from operations	(23,014)	(8,334)
Other (expense) income:
Equity in earnings of subsidiaries	0	0
Interest expense, net of interest capitalized	(6,254)	(5,455)
Other	(389)	(2,680)
Total other (expense) income	(6,643)	(8,135)
Income (loss) before income taxes	(29,657)	(16,469)
Income tax (expense) benefit	1,958	4,450
Net income (loss)	(27,699)	(12,019)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	73,856	173,853
Costs and expenses:
Operating Costs	50,310	115,539
Depreciation and amortization	27,731	37,677
General and administrative	10,548	16,255
Bad debt expense (recovery)	(55)	319
Loss (gain) on dispositions of property and equipment	(555)	1,133
Impairment charges		5,990
Intercompany leasing	(1,215)	(1,215)
Total costs and expenses	86,764	175,698
Income (loss) from operations	(12,908)	(1,845)
Other (expense) income:
Equity in earnings of subsidiaries	(4,846)	(4,589)
Interest expense, net of interest capitalized	(22)	(4)
Other	320	452
Total other (expense) income	(4,548)	(4,141)
Income (loss) before income taxes	(17,456)	(5,986)
Income tax (expense) benefit	1,039	523
Net income (loss)	(16,417)	(5,463)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	1,096	19,961
Costs and expenses:
Operating Costs	1,979	15,525
Depreciation and amortization	1,761	3,756
General and administrative	213	668
Bad debt expense (recovery)	0	0
Loss (gain) on dispositions of property and equipment	(45)	0
Impairment charges		0
Intercompany leasing	1,215	1,215
Total costs and expenses	5,123	21,164
Income (loss) from operations	(4,027)	(1,203)
Other (expense) income:
Equity in earnings of subsidiaries	0	0
Interest expense, net of interest capitalized	2	4
Other	(564)	(3,003)
Total other (expense) income	(562)	(2,999)
Income (loss) before income taxes	(4,589)	(4,202)
Income tax (expense) benefit	(257)	(387)
Net income (loss)	(4,846)	(4,589)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses:
Operating Costs	0	0
Depreciation and amortization	0	0
General and administrative	(138)	(138)
Bad debt expense (recovery)	0	0
Loss (gain) on dispositions of property and equipment	0	0
Impairment charges		0
Intercompany leasing	0	0
Total costs and expenses	(138)	(138)
Income (loss) from operations	138	138
Other (expense) income:
Equity in earnings of subsidiaries	21,263	10,052
Interest expense, net of interest capitalized	0	0
Other	(138)	(138)
Total other (expense) income	21,125	9,914
Income (loss) before income taxes	21,263	10,052
Income tax (expense) benefit	0	0
Net income (loss)	21,263	10,052
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0
Costs and expenses:
Operating Costs	0	0
Depreciation and amortization	332	349
General and administrative	5,885	5,075
Bad debt expense (recovery)	0	0
Loss (gain) on dispositions of property and equipment	0	0
Impairment charges		0
Intercompany leasing	0	0
Total costs and expenses	6,217	5,424
Income (loss) from operations	(6,217)	(5,424)
Other (expense) income:
Equity in earnings of subsidiaries	(16,417)	(5,463)
Interest expense, net of interest capitalized	(6,234)	(5,455)
Other	(7)	9
Total other (expense) income	(22,658)	(10,909)
Income (loss) before income taxes	(28,875)	(16,333)
Income tax (expense) benefit	1,176	4,314
Net income (loss)	$ (27,699)	$ (12,019)