CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 7,793	$ 9,822
Restricted cash	8,068	6,700
Accounts receivable, net	116,526	143,695
Inventories	47,610	54,161
Regulatory assets	25,565	40,301
Deferred income taxes	22,206	37,143
Other	18,313	11,306
Total current assets	246,081	303,128
Property, plant, and equipment, net	2,532,359	2,435,590
Goodwill	355,128	355,128
Regulatory assets	390,511	367,890
Other noncurrent assets	26,969	23,797
Total assets	3,551,048	3,485,533
Current Liabilities:
Current maturities of capital leases	1,656	1,612
Short-term borrowings	64,994	122,934
Accounts payable	58,287	83,746
Accrued expenses	179,194	192,548
Regulatory liabilities	48,352	48,425
Total current liabilities	352,483	449,265
Long-term capital leases	30,739	31,562
Long-term debt	1,055,085	1,055,074
Deferred income taxes	381,155	363,928
Noncurrent regulatory liabilities	339,304	276,618
Other noncurrent liabilities	390,032	375,054
Total liabilities	2,548,798	2,551,501
Commitments and Contingencies (Note 13)
Shareholders' Equity:
Common stock, par value $0.01; authorized 200,000,000 shares; issued and outstanding 42,048,148 and 38,448,254 respectively; Preferred stock, par value $0.01; authorized 50,000,000 shares; none issued	420	408
Treasury stock at cost	(91,881)	(90,702)
Paid-in capital	895,218	849,218
Retained earnings	196,407	172,791
Accumulated other comprehensive income	2,086	2,317
Total shareholders' equity	1,002,250	934,032
Total liabilities and shareholders' equity	$ 3,551,048	$ 3,485,533