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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 11,725 | $ 2,639
Accounts receivable, net | 69,720 | 58,925
Unbilled receivables | 127 | 4,765
Inventories | 19,136 | 21,415
Prepaid expenses and other current assets | 11,378 | 4,433
Total current assets | 112,086 | 92,177
Property, plant and equipment, net | 274,676 | 230,461
Operating lease right-of-use assets | 32,099 | 28,178
Intangible assets, net | 8,253 | 9,046
Other assets | 563 | 3,541
Total assets | 427,677 | 363,403
Current liabilities: |  |
Accounts payable | 3,268 | 3,961
Accrued expenses and other liabilities | 13,142 | 8,578
Deferred revenue, current | 6,875 | 7,654
Income taxes payable | 0 | 542
Long-term debt, net, current | 6,901 | 6,175
Operating lease liabilities, current | 7,077 | 13,108
Total current liabilities | 37,263 | 40,018
Deferred revenue, net | 3,482 | 1,670
Long-term debt, net | 22,445 | 28,240
Operating lease liabilities, long-term | 27,020 | 15,469
Deferred tax liabilities, long-term, net | 32,981 | 24,408
Asset retirement obligation | 14,996 | 6,142
Contingent consideration | 180 | 1,900
Other non-current liabilities | 503 | 0
Total liabilities | 138,870 | 117,847
Commitments and contingencies (Note 17) |  |
Stockholders’ equity |  |
Common stock, $0.001 par value, 350,000,000 shares authorized; 43,193,394 issued and 41,575,129 outstanding at December 31, 2020; 40,975,408 issued and 40,234,451 outstanding at December 31, 2019 | 42 | 40
Treasury stock, at cost, 1,618,265 and 740,957 shares at December 31, 2020 and 2019, respectively | (4,134) | (2,979)
Additional paid-in capital | 171,209 | 165,223
Retained earnings | 121,267 | 83,313
Accumulated other comprehensive income (loss) | 423 | (41)
Total stockholders’ equity | 288,807 | 245,556
Total liabilities and stockholders’ equity | $ 427,677 | $ 363,403

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