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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES:    
Net income (loss) $ (83,881) $ 37,207
Adjustment for loss from discontinued operations 854 3,865
Income (loss) from continuing operations (83,027) 41,072
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 286,624 283,646
Amortization of debt discount and debt issuance costs 525 558
Provision for bad debt 3,820  
Stock-based compensation 12,479 13,987
Pension settlement charge   1,454
Income from asset sales (15,731) (7,273)
Deferred income tax expense (34,038) 4,877
Other 32 105
Change in assets and liabilities:    
Accounts receivable 30,278 115,222
Inventories (7,273) (1,108)
Prepaid expenses and other 17,830 13,753
Accounts payable 31,359 (13,574)
Accrued liabilities (76,879) 51,059
Deferred income taxes (1,244) 2,580
Other noncurrent liabilities (18,316) (13,939)
Net cash provided by operating activities from continuing operations 146,439 492,419
Net cash provided by (used in) operating activities from discontinued operations (80) 98
Net cash provided by operating activities 146,359 492,517
INVESTING ACTIVITIES:    
Capital expenditures (175,303) (180,481)
Purchase of short-term investments (37,899) (21,869)
Proceeds from sale of short-term investments 34,000 21,676
Proceeds from asset sales 13,459 9,715
Net cash used in investing activities (165,743) (170,959)
FINANCING ACTIVITIES:    
Debt issuance costs   (32)
Dividends paid (152,617) (149,300)
Exercise of stock options, net of tax withholding 9,946 (199)
Tax withholdings related to net share settlements of restricted stock (5,679) (3,617)
Excess tax benefit from stock-based compensation 3,919 219
Net cash used in financing activities (144,431) (152,929)
Net increase (decrease) in cash and cash equivalents (163,815) 168,629
Cash and cash equivalents, beginning of period 905,561 729,384
Cash and cash equivalents, end of period $ 741,746 $ 898,013