Unaudited Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 46,218us-gaap_NetIncomeLoss	$ 83,397us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	44,575us-gaap_Depreciation	32,544us-gaap_Depreciation
Amortization	2,504	1,172
Provision for doubtful accounts and inventory obsolescence	0	430
Deferred income tax provision (benefit)	(3,380)us-gaap_DeferredIncomeTaxExpenseBenefit	196us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expense	4,024us-gaap_ShareBasedCompensation	3,354us-gaap_ShareBasedCompensation
Asset impairment	60,777	0
(Gain) loss on sale of assets	9,806	(1,637)
Changes in assets and liabilities:
Accounts receivable	27,965	26,868
Income tax receivable	(717)	(859)
Inventories of materials and supplies	(6,771)us-gaap_IncreaseDecreaseInInventories	10,842us-gaap_IncreaseDecreaseInInventories
Prepaid expenses, deferred costs and other current assets	5,095	6,458
Deferred costs and other assets	62	(8,165)
Accounts payable	(14,248)	(13,556)
Accrued liabilities	14,866	11,223
Income tax payable	(1,333)	(3,767)
Deferred credits and other liabilities	5,263	9,695
Net cash provided by operating activities	194,706	158,195
Cash flows from investing activities:
Capital expenditures	(149,042)	(462,620)
Proceeds from sale of assets	1,348	13,277
Net cash used in investing activities	(147,694)	(449,343)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	340,000
Repayments on short-term debt, net	(5,931)	(6,046)
Proceeds from exercise of stock options	784	823
Debt issuance costs paid	(142)us-gaap_PaymentsOfDebtIssuanceCosts	(72)us-gaap_PaymentsOfDebtIssuanceCosts
Net cash (used) provided by financing activities	(5,289)	334,705
Net increase in cash and cash equivalents	41,723	43,557
Cash and cash equivalents, at beginning of period	80,080	88,770
Cash and cash equivalents, at end of period	121,803	132,327
Non-cash activities:
Decrease in accrued liabilities related to capital expenditures	$ (4,525)	$ (11,092)

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