CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 7,860,000	$ 8,473,000
Restricted cash	7,451,000	3,556,000
Accounts receivable, net	162,373,000	182,282,000
Inventories	50,815,000	52,432,000
Regulatory assets	38,431,000	37,669,000
Other	10,755,000	11,947,000
Total current assets	277,685,000	296,359,000
Property, plant, and equipment, net	4,521,318,000	4,358,265,000
Goodwill	357,586,000	357,586,000
Regulatory assets	437,581,000	354,316,000
Other noncurrent assets	50,206,000	54,391,000
Total Assets	5,644,376,000	5,420,917,000
Current Liabilities:
Current maturities of capital leases	2,298,000	2,133,000
Short-term borrowings	0.0	319,556,000
Accounts payable	87,043,000	85,160,000
Accrued expenses	216,792,000	210,047,000
Regulatory liabilities	40,876,000	15,342,000
Total current liabilities	347,009,000	632,238,000
Long-term capital leases	19,915,000	22,213,000
Long-term debt	2,102,345,000	1,793,416,000
Deferred income taxes	394,618,000	340,729,000
Noncurrent regulatory liabilities	438,285,000	417,701,000
Other noncurrent liabilities	399,822,000	415,705,000
Total Liabilities	3,701,994,000	3,622,002,000
Commitments and Contingencies (Note 19)
Shareholders' Equity:
Common stock, par value $0.01; authorized 200,000,000 shares; issued and outstanding 53,889,410 and 50,323,649, respectively; Preferred stock, par value $0.01; authorized 50,000,000 shares; none issued	539,000	530,000
Treasury stock at cost	(95,546,000)	(96,376,000)
Paid-in capital	1,499,070,000	1,445,181,000
Retained earnings	548,253,000	458,352,000
Accumulated other comprehensive loss	(9,934,000)	(8,772,000)
Total Shareholders' Equity	1,942,382,000	1,798,915,000
Total Liabilities and Shareholders' Equity	$ 5,644,376,000	$ 5,420,917,000