CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 5,928	$ 6,234
Restricted cash	12,716	12,862
Accounts receivable, net	147,151	143,304
Inventories	59,532	50,701
Regulatory assets	48,900	59,993
Deferred income taxes	6,522	24,052
Other	9,450	5,908
Total current assets	290,199	303,054
Property, plant, and equipment, net	2,213,267	2,117,977
Goodwill	355,128	355,128
Regulatory assets	308,804	222,341
Other noncurrent assets	43,040	39,169
Total assets	3,210,438	3,037,669
Current Liabilities:
Current maturities of capital leases	1,370	1,276
Current maturities of long-term debt	3,792	6,578
Short-term borrowings	166,934	0
Accounts payable	76,735	75,042
Accrued expenses	193,939	203,900
Regulatory liabilities	33,184	17,173
Total current liabilities	475,954	303,969
Long-term capital leases	32,918	34,288
Long-term debt	905,049	1,061,780
Deferred income taxes	282,406	232,709
Noncurrent regulatory liabilities	265,987	251,133
Other noncurrent liabilities	389,012	333,443
Total liabilities	2,351,326	2,217,322
Commitments and Contingencies (Note 18)
Shareholders' Equity:
Common stock, par value $0.01; authorized 200,000,000 shares; issued and outstanding 39,840,838 and 36,278,206 respectively; Preferred stock, par value $0.01; authorized 50,000,000 shares; none issued	398	398
Treasury stock at cost	(90,273)	(90,427)
Paid-in capital	816,700	813,878
Retained earnings	128,631	87,984
Accumulated other comprehensive income	3,656	8,514
Total shareholders' equity	859,112	820,347
Total liabilities and shareholders' equity	$ 3,210,438	$ 3,037,669