CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 88,770	$ 77,871
Accounts receivable	199,689	167,186
Income tax receivable	4,672	5,750
Inventories of materials and supplies	121,833	80,290
Prepaid expenses and deferred costs	38,796	39,437
Total current assets	453,760	370,534
Property and equipment, net	3,164,724	2,537,340
Other receivables	11,831	11,875
Deferred costs and other assets	26,951	24,013
Total assets	3,657,266	2,943,762
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	95,827	83,592
Accrued liabilities	17,653	19,603
Notes payable	8,071	5,148
Interest payable	7,945	4,875
Income tax payable	16,554	10,691
Deferred credits	10,822	13,738
Total current liabilities	156,872	137,647
Long-term debt	1,263,232	830,000
Deferred income taxes	485	321
Deferred credits	1,176	8,928
Other	28,130	27,444
Total long-term liabilities	1,293,023	866,693
Commitments and contingencies (Note 12)
Shareholders’ equity (Note 8):
Preferred stock, no par value, 1,000 shares authorized, none outstanding	0	0
Common stock, $1.00 par value, 90,000 shares authorized with 64,057 and 65,452 issued and outstanding at September 30, 2013 and 2012, respectively	64,057	65,452
Paid-in capital	183,390	160,540
Retained earnings	1,961,405	1,716,441
Accumulated other comprehensive loss	(1,481)	(3,011)
Total shareholders’ equity	2,207,371	1,939,422
Total liabilities and shareholders’ equity	$ 3,657,266	$ 2,943,762