CONSOLIDATED CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Current assets:
Cash and cash equivalents	$ 848,230	$ 729,384	$ 252,732	$ 360,307
Short-term Investments	47,708	45,543
Accounts receivable, less reserve of $6,167 at December 31, 2015 and $6,181 at September 30, 2015	373,896	445,948
Inventories	127,242	128,541
Deferred income taxes		17,206
Prepaid expenses and other	71,151	64,475
Current assets of discontinued operations	8,449	8,097
Total current assets	1,476,676	1,439,194
Investments	85,276	104,354
Property, plant and equipment, net	5,530,817	5,563,170
Other assets	37,505	40,524
Total assets	7,130,274	7,147,242
Current liabilities:
Long-term debt due within one year less unamortized debt issuance costs	39,092	39,094
Accounts payable	96,442	108,169
Accrued liabilities	269,946	197,557
Current liabilities of discontinued operations	3,310	3,377
Total current liabilities	408,790	348,197
Noncurrent liabilities:
Long-term debt due within one year less unamortized debt issuance costs	492,668	492,443
Deferred income taxes	1,295,601	1,295,916
Other	97,783	110,120
Noncurrent liabilities of discontinued operations	5,139	4,720
Total noncurrent liabilities	1,891,191	1,903,199
Shareholders' equity:
Common stock, $.10 par value, 160,000,000 shares authorized, 111,295,615 shares and 110,987,546 shares issued as of December 31, 2015 and September 30, 2015, respectively and 108,010,599 shares and 107,767,915 shares outstanding as of December 31, 2015 and September 30, 2015, respectively	$ 11,130	$ 11,099
Preferred stock, no par value, 1,000,000 shares authorized, no shares issued
Additional paid-in capital	$ 427,590	$ 420,141
Retained earnings	4,589,597	4,648,346
Accumulated other comprehensive income loss	(12,074)	(1,377)
Treasury stock, at cost	(185,950)	(182,363)
Total shareholders' equity	4,830,293	4,895,846
Total liabilities and shareholders' equity	$ 7,130,274	$ 7,147,242