CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
ASSETS
Cash	$ 160,110	$ 145,427
Accounts receivable, net of allowance of $2.3 million and $1.2 million as of December 31, 2016 and September 30, 2016, respectively	95,464	113,091
Income tax receivable	6,471	6,095
Inventories of materials and supplies, net	110,462	109,925
Prepaid expenses, deferred costs and other current assets	15,745	18,504
Total current assets	388,252	393,042
Property and equipment, net	4,223,156	4,127,696
Other receivables	11,831	11,831
Deferred income taxes	165	165
Deferred costs and other assets	6,253	7,058
Total assets	4,629,657	4,539,792
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	22,290	25,299
Accrued liabilities	9,076	7,868
Interest payable	14,896	7,096
Income tax payable	8,313	8,294
Deferred credits and other liabilities	285	799
Total current liabilities	54,860	49,356
Long-term debt	1,297,995	1,227,919
Deferred income taxes	1,403	1,202
Deferred credits	350	0
Other	30,613	30,929
Total long-term liabilities	1,330,361	1,260,050
Commitments and contingencies (Note 8)
Preferred stock, no par value, 1,000 shares authorized, none outstanding	0	0
Common stock, $1.00 par value, 180,000 shares authorized with 64,942 issued and outstanding as of December 31, 2016 and 180,000 shares authorized and 64,799 shares issued and outstanding as of September 30, 2016	64,942	64,799
Paid-in capital	241,558	237,542
Retained earnings	2,938,546	2,929,839
Accumulated other comprehensive loss	(610)	(1,794)
Total shareholders' equity	3,244,436	3,230,386
Total liabilities and shareholders' equity	$ 4,629,657	$ 4,539,792