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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 53,981 | $ 84,344
Accounts receivable, net of allowance for doubtful accounts of $347 and $352, respectively | 15,757 | 22,005
Income taxes receivable | 29,729 | 30,188
Prepaid expenses and other | 26,643 | 29,830
Total current assets | 126,110 | 166,367
Investments | 13,284 | 13,661
Property, plant and equipment, net | 581,541 | 554,162
Intangible assets, net and goodwill | 89,633 | 89,831
Operating lease right-of-use assets | 57,130 | 56,414
Deferred charges and other assets | 15,553 | 10,298
Total assets | 883,251 | 890,733
Current liabilities: |  |
Accounts payable | 21,422 | 28,542
Advanced billings and customer deposits | 11,128 | 11,128
Accrued compensation | 7,132 | 9,653
Current operating lease liabilities | 3,087 | 3,318
Accrued liabilities and other | 14,289 | 14,649
Total current liabilities | 57,058 | 67,290
Other long-term liabilities: |  |
Deferred income taxes | 85,665 | 86,014
Asset retirement obligations | 9,747 | 9,615
Benefit plan obligations | 8,097 | 8,216
Non-current operating lease liabilities | 52,719 | 51,692
Other liabilities | 25,636 | 25,631
Total other long-term liabilities | 181,864 | 181,168
Commitments and contingencies |  |
Shareholders’ equity: |  |
Common stock, no par value, authorized 96,000; 50,049 and 49,965 issued and outstanding at March 31, 2022 and December 31, 2021, respectively | 0 | 0
Additional paid in capital | 52,008 | 49,351
Retained earnings | 592,321 | 592,924
Total shareholders’ equity | 644,329 | 642,275
Total liabilities and shareholders’ equity | $ 883,251 | $ 890,733

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