CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 5,079	$ 11,980
Restricted cash	4,426	6,634
Accounts receivable, net	159,556	154,410
Inventories	49,206	53,458
Regulatory assets	50,041	51,348
Other	11,887	8,830
Total current assets	280,195	286,660
Property, plant, and equipment, net	4,214,892	4,059,499
Goodwill	357,586	357,586
Regulatory assets	602,943	517,223
Other noncurrent assets	43,705	43,727
Total Assets	5,499,321	5,264,695
Current Liabilities:
Current maturities of capital leases	1,979	1,837
Short-term borrowings	300,811	229,874
Accounts payable	79,311	74,511
Accrued expenses	205,370	183,988
Regulatory liabilities	26,361	80,990
Total current liabilities	613,832	571,200
Long-term capital leases	24,346	26,325
Long-term debt	1,793,338	1,768,183
Deferred income taxes	575,582	501,532
Noncurrent regulatory liabilities	396,225	378,711
Other noncurrent liabilities	419,771	418,570
Total Liabilities	3,823,094	3,664,521
Commitments and Contingencies (Note 19)
Shareholders' Equity:
Common stock, par value $0.01; authorized 200,000,000 shares; issued and outstanding 51,957,840 and 48,331,675, respectively; Preferred stock, par value $0.01; authorized 50,000,000 shares; none issued	520	518
Treasury stock at cost	(95,769)	(93,948)
Paid-in capital	1,384,271	1,376,291
Retained earnings	396,919	325,909
Accumulated other comprehensive loss	(9,714)	(8,596)
Total Shareholders' Equity	1,676,227	1,600,174
Total Liabilities and Shareholders' Equity	$ 5,499,321	$ 5,264,695