Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (214,514)	$ (675,658)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	331,151	392,017
Deferred income taxes	(92,999)	(186,232)
Reduction in value of assets	9,953	462,461
Stock based compensation expense	29,780	34,167
Other reconciling items, net	(2,408)	(10,392)
Changes in operating assets and liabilities:
Accounts receivable	(116,989)	155,717
Inventory and other current assets	(8,510)	(5,028)
Accounts payable	24,821	(8,692)
Accrued expenses	7,182	(41,617)
Income taxes	100,969	(4,515)
Other, net	(13,028)	34,447
Net cash provided by operating activities	55,408	146,675
Cash flows from investing activities:
Payments for capital expenditures	(109,635)	(74,071)
Decrease in cash held in escrow	30,600
Other	15,647	6,238
Net cash used in investing activities	(63,388)	(67,833)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	500,000
Principal payments on long-term debt	(500,000)	(337,576)
Payment of debt issuance costs	(9,091)	(2,675)
Proceeds from revolving line of credit		325,123
Payments on revolving line of credit		(325,123)
Cash dividends		(12,111)
Other	(6,789)	(5,410)
Net cash used in financing activities	(15,880)	(357,772)
Effect of exchange rate changes on cash	3,294	(6,932)
Net decrease in cash and cash equivalents	(20,566)	(285,862)
Cash and cash equivalents at beginning of period	187,591	564,017
Cash and cash equivalents at end of period	$ 167,025	$ 278,155