Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
ASSETS
Cash	$ 226,812	$ 113,983
Accounts receivable, net	240,740	311,514
Income tax receivable	8,198	8,705
Inventories of materials and supplies, net	110,029	137,998
Prepaid expenses, deferred costs and other current assets	18,790	33,735
Total current assets	604,569	605,935
Property and equipment, net	4,209,558	4,172,132
Other receivables	11,831	11,831
Deferred income taxes	150	150
Deferred costs and other assets	8,884	11,285
Total assets	4,834,992	4,801,333
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	43,878	70,161
Accrued liabilities	19,294	23,572
Dividends payable	0	16,164
Interest payable	8,222	7,704
Income tax payable	20,440	13,906
Deferred credits and other liabilities	3,834	3,941
Total current liabilities	95,668	135,448
Long-term debt	1,595,018	1,678,268
Deferred income taxes	1,096	1,658
Deferred credits	71	800
Other	38,032	37,989
Total long-term liabilities	$ 1,634,217	$ 1,718,715
Commitments and contingencies
Preferred stock, no par value, 1,000 shares authorized, none outstanding	$ 0	$ 0
Common stock, $1.00 par value, 180,000 shares authorized with 64,794 issued and outstanding as of March 31, 2016 and 180,000 shares authorized and 64,654 shares issued and outstanding as of September 30, 2015	64,794	64,654
Paid-in capital	217,037	213,096
Retained earnings	2,826,084	2,670,148
Accumulated other comprehensive income	(2,808)	(728)
Total shareholders' equity	3,105,107	2,947,170
Total liabilities and shareholders' equity	$ 4,834,992	$ 4,801,333