CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
REVENUES	$ 1,263,840	$ 2,337,413	$ 1,861,489
COSTS AND EXPENSES:
Cost of revenues (exclusive of items shown separately below)	986,144	1,493,082	1,178,412
Selling, general and administrative expenses	156,579	197,117	183,139
Depreciation and amortization	270,977	230,813	213,128
Loss on disposition of assets, net	6,417	15,472	9,371
Operating (loss) profit	(156,277)	400,929	277,439
Interest expense	(2,032)	(1,431)	(1,822)
Interest income	83	19	408
Other income (expense), net	5,185	(131)	245
(Loss) income before income taxes	(153,041)	399,386	276,270
Income tax (benefit) provision	(53,480)	154,193	109,375
Net (loss) income	$ (99,561)	$ 245,193	$ 166,895
(LOSS) EARNINGS PER SHARE
Basic (in dollars per share)	$ (0.47)	$ 1.14	$ 0.77
Diluted (in dollars per share)	(0.47)	1.14	0.77
Dividends paid per share (in dollars per share)	$ 0.155	$ 0.420	$ 0.400