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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
OPERATING REVENUES        
Utility $ 351,750 $ 226,023 $ 570,599 $ 417,397
Nonutility 609,135 386,898 1,126,305 837,935
Total operating revenues 960,885 612,921 1,696,904 1,255,332
OPERATING EXPENSES        
Gas Purchases - Utility 189,040 78,301 300,361 163,931
Gas Purchases - Nonutility 611,567 382,055 1,066,994 788,472
Operation and maintenance 43,067 39,185 83,137 78,130
Regulatory rider expenses 23,774 18,443 37,756 30,986
Depreciation and amortization 11,721 10,439 23,024 20,039
Energy and other taxes 24,747 16,809 41,472 30,867
Total operating expenses 903,916 545,232 1,552,744 1,112,425
OPERATING INCOME 56,969 67,689 144,160 142,907
Other income 2,781 349 3,046 876
Interest expense, net of capitalized interest 5,746 5,427 11,571 10,432
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES 54,004 62,611 135,635 133,351
Income tax provision 12,065 11,094 36,045 27,131
Equity in earnings of affiliates 3,530 3,018 6,085 5,672
NET INCOME $ 45,469 $ 54,535 $ 105,675 $ 111,892
EARNINGS PER COMMON SHARE        
BASIC (usd per share) $ 1.09 $ 1.31 $ 2.53 $ 2.70
DILUTED (usd per share) $ 1.08 [1] $ 1.31 [1] $ 2.52 [1] $ 2.68 [1]
DIVIDENDS PER COMMON SHARE (usd per share) $ 0.40 $ 0.38 $ 0.80 $ 0.76
WEIGHTED AVERAGE SHARES OUTSTANDING        
BASIC (in shares) 41,789 41,509 41,742 41,472
DILUTED (in shares) 41,972 41,711 41,925 41,673
[1] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for the three and six months ended March 31, 2013 and 2012.