CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net loss	$ (120,139)	$ (61,680)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and other non-cash charges	171,642	208,420
Stock-based compensation expense	8,065	7,695
(Gain) loss on disposition of assets, net	(3,919)	1,115
Deferred income tax benefit	(31,677)	(52,038)
Excess tax benefits for share-based payments	(360)	(1,410)
(Increase) decrease in assets:
Accounts receivable	89,173	348,939
Income taxes receivable	1,488	3,447
Inventories	17,843	18,629
Prepaid expenses	4,436	3,089
Other current assets	(378)	(4,666)
Other non-current assets	(1,251)	1,691
Increase (decrease) in liabilities:
Accounts payable	(21,603)	(63,200)
Income taxes payable	(3,613)	5,017
Accrued payroll and related expenses	(2,067)	(28,743)
Accrued insurance expenses	636	(902)
Accrued state, local and other taxes	4,154	499
Other accrued expenses	52	(249)
Pension liabilities	(2,121)	(146)
Long-term accrued insurance expenses	(1,642)	775
Other long-term liabilities	(14,159)	3
Net cash provided by operating activities	94,560	386,285
INVESTING ACTIVITIES
Capital expenditures	(24,917)	(155,202)
Proceeds from sale of assets	7,141	7,935
Net cash used for investing activities	(17,776)	(147,267)
FINANCING ACTIVITIES
Payment of dividends		(33,599)
Borrowings from notes payable to banks		588,400
Repayments of notes payable to banks		(793,400)
Debt issuance costs for notes payable to banks	(35)
Excess tax benefits for share-based payments	360	1,410
Cash paid for common stock purchased and retired	(3,218)	(4,093)
Net cash used for financing activities	(2,893)	(241,282)
Net increase (decrease) in cash and cash equivalents	73,891	(2,264)
Cash and cash equivalents at beginning of period	65,196	9,772
Cash and cash equivalents at end of period	139,087	7,508
Supplemental cash flows disclosure:
Interest paid, net of amounts capitalized	373	1,124
Income taxes (received) paid, net	(39,333)	8,535
Supplemental disclosure of noncash investing activities:
Capital expenditures included in accounts payable	$ 3,002	$ 5,349