Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Statements of Operations (Unaudited)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 68,353	$ 107,480	$ 205,595	$ 436,305
Costs and expenses:
Operating Costs	51,688	71,646	147,492	288,631
Depreciation and amortization	28,663	35,257	87,409	115,528
General and administrative	14,312	16,686	46,078	56,909
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	(359)	(1,071)	(302)	(358)
Impairment charges	4,262	2,329	4,262	79,648
Loss (gain) on dispositions of property and equipment, net	(328)	605	(420)	(2,639)
Total costs and expenses	98,238	125,452	284,519	537,719
Income (loss) from operations	(29,885)	(17,972)	(78,924)	(101,414)
Other (expense) income:
Equity in earnings of subsidiaries	0	0	0	0
Interest expense	(6,678)	(4,975)	(19,307)	(15,675)
Loss on extinguishment of debt	0	490	299	490
Other	245	(785)	574	(2,979)
Total other (expense) income	(6,433)	(6,250)	(19,032)	(19,144)
Income (loss) before income taxes	(36,318)	(24,222)	(97,956)	(120,558)
Income tax (expense) benefit	1,698	6,682	5,646	13,718
Net income (loss)	(34,620)	(17,540)	(92,310)	(106,840)
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)	(414)	(414)
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	0	0	0	0
Impairment charges	0	0	0	(750)
Loss (gain) on dispositions of property and equipment, net	0	0	0	0
Total costs and expenses	(138)	(138)	(414)	(1,164)
Income (loss) from operations	138	138	414	1,164
Other (expense) income:
Equity in earnings of subsidiaries	28,381	17,517	72,198	160,651
Interest expense	0	0	0	0
Loss on extinguishment of debt		0	0	0
Other	(138)	(138)	(414)	(414)
Total other (expense) income	28,243	17,379	71,784	160,237
Income (loss) before income taxes	28,381	17,517	72,198	161,401
Income tax (expense) benefit	0	0	0	0
Net income (loss)	28,381	17,517	72,198	161,401
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	67,731	104,810	203,616	399,596
Costs and expenses:
Operating Costs	50,061	67,682	142,766	258,125
Depreciation and amortization	26,659	32,797	81,257	104,841
General and administrative	9,017	11,543	29,061	39,916
Intercompany leasing	(1,215)	(1,215)	(3,645)	(3,645)
Bad debt expense (recovery)	(359)	(1,071)	(302)	(358)
Impairment charges	4,262	2,329	4,262	23,766
Loss (gain) on dispositions of property and equipment, net	(325)	651	(366)	(2,572)
Total costs and expenses	88,100	112,716	253,033	420,073
Income (loss) from operations	(20,369)	(7,906)	(49,417)	(20,477)
Other (expense) income:
Equity in earnings of subsidiaries	(4,587)	(6,309)	(13,777)	(73,472)
Interest expense	(14)	2	(88)	(120)
Loss on extinguishment of debt		0	0	0
Other	217	472	1,222	1,343
Total other (expense) income	(4,384)	(5,835)	(12,643)	(72,249)
Income (loss) before income taxes	(24,753)	(13,741)	(62,060)	(92,726)
Income tax (expense) benefit	959	2,533	3,639	5,547
Net income (loss)	(23,794)	(11,208)	(58,421)	(87,179)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Revenues	622	2,670	1,979	36,709
Costs and expenses:
Operating Costs	1,627	3,964	4,726	30,506
Depreciation and amortization	1,701	2,135	5,192	9,667
General and administrative	387	417	1,107	1,783
Intercompany leasing	1,215	1,215	3,645	3,645
Bad debt expense (recovery)	0	0	0	0
Impairment charges	0	0	0	56,632
Loss (gain) on dispositions of property and equipment, net	(3)	(174)	(54)	(195)
Total costs and expenses	4,927	7,557	14,616	102,038
Income (loss) from operations	(4,305)	(4,887)	(12,637)	(65,329)
Other (expense) income:
Equity in earnings of subsidiaries	0	0	0	0
Interest expense	(3)	6	1	18
Loss on extinguishment of debt		0	0	0
Other	152	(1,098)	(246)	(3,894)
Total other (expense) income	149	(1,092)	(245)	(3,876)
Income (loss) before income taxes	(4,156)	(5,979)	(12,882)	(69,205)
Income tax (expense) benefit	(431)	(330)	(895)	(4,267)
Net income (loss)	(4,587)	(6,309)	(13,777)	(73,472)
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	303	325	960	1,020
General and administrative	5,046	4,864	16,324	15,624
Intercompany leasing	0	0	0	0
Bad debt expense (recovery)	0	0	0	0
Impairment charges	0	0	0	0
Loss (gain) on dispositions of property and equipment, net	0	128	0	128
Total costs and expenses	5,349	5,317	17,284	16,772
Income (loss) from operations	(5,349)	(5,317)	(17,284)	(16,772)
Other (expense) income:
Equity in earnings of subsidiaries	(23,794)	(11,208)	(58,421)	(87,179)
Interest expense	(6,661)	(4,983)	(19,220)	(15,573)
Loss on extinguishment of debt		490	299	490
Other	14	(21)	12	(14)
Total other (expense) income	(30,441)	(16,702)	(77,928)	(103,256)
Income (loss) before income taxes	(35,790)	(22,019)	(95,212)	(120,028)
Income tax (expense) benefit	1,170	4,479	2,902	12,438
Net income (loss)	$ (34,620)	$ (17,540)	$ (92,310)	$ (107,590)