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