Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenues	$ 590,097	$ 446,455	$ 277,076
Costs and expenses:
Operating costs	429,913	330,880	203,949
Depreciation	93,554	98,777	114,312
General and administrative	74,117	69,681	61,184
Bad debt expense	271	53	156
Impairment	4,422	1,902	12,815
Gain on dispositions of property and equipment, net	(3,121)	(3,608)	(1,892)
Total costs and expenses	599,156	497,685	390,524
Loss from operations	(9,059)	(51,230)	(113,448)
Other income (expense):
Interest expense, net of interest capitalized	(38,782)	(27,039)	(25,934)
Loss on extinguishment of debt	0	(1,476)	(299)
Other income, net	738	424	558
Total other expense, net	(38,044)	(28,091)	(25,675)
Loss before income taxes	(47,103)	(79,321)	(139,123)
Income tax (expense) benefit	(1,908)	4,203	10,732
Net loss	$ (49,011)	$ (75,118)	$ (128,391)
Loss per common share - Basic	$ (0.63)	$ (0.97)	$ (1.96)
Loss per common share - Diluted	$ (0.63)	$ (0.97)	$ (1.96)
Weighted average number of shares outstanding - Basic	77,957	77,390	65,452
Weighted average number of shares outstanding - Diluted	77,957	77,390	65,452