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BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, plant and equipment |  |
Property, plant and equipment | $ 6,073,143 | $ 5,713,912
Accumulated depreciation and amortization | 1,789,431 | 1,706,327
Net property, plant and equipment | 4,283,712 | 4,007,585
Current assets |  |
Cash and cash equivalents | 21,323 | 14,413
Accounts receivable, net | 295,421 | 298,768
Materials and supplies | 44,333 | 39,672
Natural gas in storage | 107,295 | 130,154
Regulatory assets | 54,420 | 88,180
Other current assets | 20,495 | 17,807
Total current assets | 543,287 | 588,994
Goodwill and other assets |  |
Regulatory assets | 437,479 | 405,189
Goodwill | 157,953 | 157,953
Other assets | 46,211 | 47,157
Total goodwill and other assets | 641,643 | 610,299
Total assets | 5,468,642 | 5,206,878
Equity and long-term debt |  |
Common stock, $0.01 par value: authorized 250,000,000 shares; issued 52,598,005 shares and outstanding 52,564,902 shares at December 31, 2018; issued 52,598,005 shares and outstanding 52,312,516 shares at December 31, 2017 | 526 | 526
Paid-in capital | 1,727,492 | 1,737,551
Retained earnings | 320,869 | 246,121
Accumulated other comprehensive income (loss) | (4,086) | (5,493)
Treasury stock, at cost: 33,103 shares at December 31, 2018 and 285,489 shares at December 31, 2017 | (2,145) | (18,496)
Total equity | 2,042,656 | 1,960,209
Long-term debt, excluding current maturities, and net of issuance costs of $11,457 and $8,033, respectively | 1,285,483 | 1,193,257
Total equity and long-term debt | 3,328,139 | 3,153,466
Current liabilities |  |
Notes payable | 299,500 | 357,215
Accounts payable | 174,510 | 143,681
Accrued interest | 18,924 | 18,776
Accrued taxes other than income | 47,640 | 41,324
Accrued liabilities | 30,294 | 30,058
Customer deposits | 61,183 | 60,811
Regulatory liabilities | 48,394 | 9,438
Other current liabilities | 18,446 | 12,027
Total current liabilities | 698,891 | 673,330
Deferred credits and other liabilities [Abstract] |  |
Deferred income taxes | 652,426 | 599,945
Regulatory Liability, Noncurrent | 520,866 | 519,421
Employee benefit obligations | 178,720 | 172,938
Other deferred credits | 89,600 | 87,778
Total deferred credits and other liabilities | 1,441,612 | 1,380,082
Commitments and contingencies |  |
Total liabilities and equity | $ 5,468,642 | $ 5,206,878

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