CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Utility Plant
Plant in Service	$ 6,663,912	$ 6,020,469
Utility Plant Under Finance Leases	151,467	248,635
Construction Work in Progress	303,488	258,965
Total Utility Plant	7,118,867	6,528,069
Accumulated Depreciation and Amortization	(2,506,686)	(2,293,783)
Accumulated Amortization of Finance Lease Assets	(77,285)	(73,646)
Total Utility Plant, Net	4,534,896	4,160,640
Investments and Other Property	62,136	50,952
Current Assets
Cash and Cash Equivalents	9,762	138,114
Accounts Receivable, Net	154,847	172,367
Fuel Inventory	23,731	22,783
Materials and Supplies	121,542	107,990
Regulatory Assets	138,412	106,725
Derivative Instruments	3,596	3,929
Other	21,416	25,571
Total Current Assets	473,306	577,479
Regulatory and Other Assets
Regulatory Assets	326,860	293,078
Derivative Instruments	2,763	8,402
Other	89,196	68,656
Total Regulatory and Other Assets	418,819	370,136
Total Assets	5,489,157	5,159,207
Common Stock Equity:
Common Stock (No Par Value, 75,000,000 Shares Authorized, 32,139,434 Shares Outstanding as of December 31, 2019 and 2018)	1,396,539	1,346,539
Capital Stock Expense	(6,357)	(6,357)
Retained Earnings	595,792	484,277
Accumulated Other Comprehensive Loss	(7,771)	(4,714)
Total Common Stock Equity	1,978,203	1,819,745
Preferred Stock (No Par Value, 1,000,000 Shares Authorized, None Outstanding as of December 31, 2019 and 2018)	0	0
Finance Lease Obligations	67,316
Finance Lease Obligations		19,773
Long-Term Debt, Net	1,522,087	1,615,252
Total Capitalization	3,567,606	3,454,770
Current Liabilities
Current Maturities of Long-Term Debt	80,330	0
Borrowings Under Credit Agreements	165,000	0
Finance Lease Obligations	17,086
Finance Lease Obligations		172,510
Accounts Payable	136,465	133,012
Accrued Taxes Other than Income Taxes	42,741	41,686
Accrued Employee Expenses	32,567	34,339
Accrued Interest	16,700	17,927
Regulatory Liabilities	96,017	95,094
Customer Deposits	24,568	27,650
Derivative Instruments	27,615	18,137
Other	23,678	21,555
Total Current Liabilities	662,767	561,910
Regulatory and Other Liabilities
Deferred Income Taxes, Net	432,484	369,705
Regulatory Liabilities	477,495	512,425
Pension and Other Postretirement Benefits	133,452	117,472
Derivative Instruments	48,697	19,361
Other	166,656	123,564
Total Regulatory and Other Liabilities	1,258,784	1,142,527
Commitments and Contingencies
Total Capitalization and Other Liabilities	$ 5,489,157	$ 5,159,207