Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Statements of Operations (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 62,290	$ 135,011	$ 137,242	$ 328,825
Costs and expenses:
Operating Costs	43,515	85,921	95,804	216,985
Depreciation and amortization	28,922	38,489	58,746	80,271
General and administrative	15,258	18,363	31,766	40,223
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	112	394	57	713
Impairment charges	0	71,329	0	77,319
Loss (gain) on dispositions of property and equipment, net	508	(4,377)	(92)	(3,244)
Total costs and expenses	88,315	210,119	186,281	412,267
Income (loss) from operations	(26,025)	(75,108)	(49,039)	(83,442)
Other (expense) income:
Equity in earnings of subsidiaries	0	0	0	0
Interest expense, net of interest capitalized	(6,375)	(5,245)	(12,629)	(10,700)
Loss on extinguishment of debt	299	0	299	0
Other	718	486	329	(2,194)
Total other (expense) income	(5,956)	(4,759)	(12,599)	(12,894)
Income (loss) before income taxes	(31,981)	(79,867)	(61,638)	(96,336)
Income tax (expense) benefit	1,990	2,586	3,948	7,036
Net income (loss)	(29,991)	(77,281)	(57,690)	(89,300)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0	0	0
Costs and expenses:
Operating Costs	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative	(138)	(138)	(276)	(276)
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	0	0	0	0
Impairment charges		(750)		(750)
Loss (gain) on dispositions of property and equipment, net	0	0	0
Total costs and expenses	(138)	(888)	(276)	(1,026)
Income (loss) from operations	138	888	276	1,026
Other (expense) income:
Equity in earnings of subsidiaries	22,554	133,082	43,817	143,134
Interest expense, net of interest capitalized	0	0	0	0
Loss on extinguishment of debt	0		0
Other	(138)	(138)	(276)	(276)
Total other (expense) income	22,416	132,944	43,541	142,858
Income (loss) before income taxes	22,554	133,832	43,817	143,884
Income tax (expense) benefit	0	0	0	0
Net income (loss)	22,554	133,832	43,817	143,884
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	62,029	120,933	135,885	294,786
Costs and expenses:
Operating Costs	42,395	74,904	92,705	190,443
Depreciation and amortization	26,867	34,367	54,598	72,044
General and administrative	9,496	12,118	20,044	28,373
Intercompany leasing	(1,215)	(1,215)	(2,430)	(2,430)
Bad debt expense (recovery)	112	394	57	713
Impairment charges		15,447		21,437
Loss (gain) on dispositions of property and equipment, net	514	(4,356)	(41)	(3,223)
Total costs and expenses	78,169	131,659	164,933	307,357
Income (loss) from operations	(16,140)	(10,726)	(29,048)	(12,571)
Other (expense) income:
Equity in earnings of subsidiaries	(4,344)	(62,574)	(9,190)	(67,163)
Interest expense, net of interest capitalized	(52)	(118)	(74)	(122)
Loss on extinguishment of debt	0		0
Other	685	419	1,005	871
Total other (expense) income	(3,711)	(62,273)	(8,259)	(66,414)
Income (loss) before income taxes	(19,851)	(72,999)	(37,307)	(78,985)
Income tax (expense) benefit	1,641	2,491	2,680	3,014
Net income (loss)	(18,210)	(70,508)	(34,627)	(75,971)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	261	14,078	1,357	34,039
Costs and expenses:
Operating Costs	1,120	11,017	3,099	26,542
Depreciation and amortization	1,730	3,776	3,491	7,532
General and administrative	507	698	720	1,366
Intercompany leasing	1,215	1,215	2,430	2,430
Bad debt expense (recovery)	0	0	0	0
Impairment charges		56,632		56,632
Loss (gain) on dispositions of property and equipment, net	(6)	(21)	(51)	(21)
Total costs and expenses	4,566	73,317	9,689	94,481
Income (loss) from operations	(4,305)	(59,239)	(8,332)	(60,442)
Other (expense) income:
Equity in earnings of subsidiaries	0	0	0	0
Interest expense, net of interest capitalized	2	8	4	12
Loss on extinguishment of debt	0		0
Other	166	207	(398)	(2,796)
Total other (expense) income	168	215	(394)	(2,784)
Income (loss) before income taxes	(4,137)	(59,024)	(8,726)	(63,226)
Income tax (expense) benefit	(207)	(3,550)	(464)	(3,937)
Net income (loss)	(4,344)	(62,574)	(9,190)	(67,163)
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	0	0	0	0
Costs and expenses:
Operating Costs	0	0	0	0
Depreciation and amortization	325	346	657	695
General and administrative	5,393	5,685	11,278	10,760
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	0	0	0	0
Impairment charges		0		0
Loss (gain) on dispositions of property and equipment, net	0	0	0	0
Total costs and expenses	5,718	6,031	11,935	11,455
Income (loss) from operations	(5,718)	(6,031)	(11,935)	(11,455)
Other (expense) income:
Equity in earnings of subsidiaries	(18,210)	(70,508)	(34,627)	(75,971)
Interest expense, net of interest capitalized	(6,325)	(5,135)	(12,559)	(10,590)
Loss on extinguishment of debt	299		299
Other	5	(2)	(2)	7
Total other (expense) income	(24,829)	(75,645)	(47,487)	(86,554)
Income (loss) before income taxes	(30,547)	(81,676)	(59,422)	(98,009)
Income tax (expense) benefit	556	3,645	1,732	7,959
Net income (loss)	$ (29,991)	$ (78,031)	$ (57,690)	$ (90,050)