CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
REVENUES	$ 728,974	$ 1,263,840	$ 2,337,413
COSTS AND EXPENSES:
Cost of revenues (exclusive of items shown separately below)	607,888	986,144	1,493,082
Selling, general and administrative expenses	150,690	156,579	197,117
Depreciation and amortization	217,258	270,977	230,813
(Gain) loss on disposition of assets, net	(7,920)	6,417	15,472
Operating (loss) profit	(238,942)	(156,277)	400,929
Interest expense	(681)	(2,032)	(1,431)
Interest income	467	83	19
Other (expense) income, net	(204)	5,185	(131)
(Loss) income before income taxes	(239,360)	(153,041)	399,386
Income tax (benefit) provision	(98,114)	(53,480)	154,193
Net (loss) income	$ (141,246)	$ (99,561)	$ 245,193
(LOSS) EARNINGS PER SHARE
Basic (in dollars per share)	$ (0.66)	$ (0.47)	$ 1.14
Diluted (in dollars per share)	(0.66)	(0.47)	1.14
Dividends paid per share (in dollars per share)	$ 0.050	$ 0.155	$ 0.420