CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
OPERATING REVENUES
Utility	$ 394,528		$ 351,750		$ 627,997		$ 570,599
Nonutility	1,185,041		609,135		1,829,977		1,126,305
Total operating revenues	1,579,569		960,885		2,457,974		1,696,904
OPERATING EXPENSES
Gas Purchases - Utility	147,946		189,040		259,148		300,361
Gas Purchases - Nonutility	1,047,870		611,567		1,711,400		1,066,994
Operation and maintenance	61,273		43,067		103,296		83,137
Regulatory rider expenses	38,211		23,774		58,043		37,756
Depreciation and amortization	12,828		11,721		25,394		23,024
Energy and other taxes	24,429		24,747		41,457		41,472
Total operating expenses	1,332,557		903,916		2,198,738		1,552,744
OPERATING INCOME	247,012		56,969		259,236		144,160
Other income	712		2,781		1,839		3,046
Interest expense, net of capitalized interest	6,306		5,746		12,601		11,571
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	241,418		54,004		248,474		135,635
Income tax provision	71,680		12,065		73,185		36,045
Equity in earnings of affiliates	3,233		3,530		5,375		6,085
NET INCOME	$ 172,971		$ 45,469		$ 180,664		$ 105,675
EARNINGS PER COMMON SHARE
BASIC (usd per share)	$ 4.11		$ 1.09		$ 4.30		$ 2.53
DILUTED (usd per share)	$ 4.07	[1]	$ 1.08	[1]	$ 4.26	[1]	$ 2.52	[1]
DIVIDENDS PER COMMON SHARE (usd per share)	$ 0.42		$ 0.40		$ 0.84		$ 0.80
WEIGHTED AVERAGE SHARES OUTSTANDING
BASIC (in shares)	42,079		41,789		42,050		41,742
DILUTED (in shares)	42,457		41,972		42,428		41,925

[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, 2014 and 2013.