CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
REVENUE - Service revenue	$ 282,730	$ 116,904	$ 668,153	$ 272,999
COSTS AND EXPENSES
Cost of services (exclusive of depreciation and amortization)	225,433	110,223	551,775	255,362
General and administrative (inclusive of stock-based compensation)	11,106	5,856	38,881	17,197
Depreciation and amortization	14,745	10,790	38,602	32,669
Loss on disposal of assets	8,742	5,923	28,971	12,859
Total costs and expenses	260,026	132,792	658,229	318,087
OPERATING INCOME (LOSS)	22,704	(15,888)	9,924	(45,088)
OTHER INCOME (EXPENSE):
Interest expense	(644)	(4,550)	(6,469)	(15,942)
Gain on extinguishment of debt	0	0	0	6,975
Other expense	(191)	(106)	(792)	(419)
Total other income (expense)	(835)	(4,656)	(7,261)	(9,386)
INCOME (LOSS) BEFORE INCOME TAXES	21,869	(20,544)	2,663	(54,474)
INCOME TAX (EXPENSE)/BENEFIT	96	6,946	(128)	18,644
NET INCOME (LOSS)	$ 21,965	$ (13,598)	$ 2,535	$ (35,830)
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.26	$ (0.26)	$ 0.03	$ (0.84)
Diluted (in dollars per share)	$ 0.25	$ (0.26)	$ 0.03	$ (0.84)
Denominator
Basic (in shares)	83,040	52,975	74,124	42,526
Diluted (in shares)	86,264	52,975	77,118	42,526