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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 2,639 $ 1,466
Accounts receivable, net 60,052 18,989
Unbilled receivables 4,765 7,823
Inventories 21,415 18,575
Prepaid expenses and other current assets 1,506 3,243
Total current assets 90,377 50,096
Property, plant and equipment, net 230,461 248,396
Intangible assets, net 9,046 18,068
Other assets 3,541 3,732
Total assets 361,603 320,292
Current liabilities:    
Accounts payable 3,961 11,336
Accrued and other expenses 8,578 8,392
Deferred revenue, current 7,654 4,095
Long-term debt, net, current 6,175 829
Total current liabilities 40,018 24,652
Long-term debt, net 28,240 47,893
Deferred tax liabilities, long-term, net 24,021 17,898
Asset retirement obligation 6,142 13,322
Contingent consideration 1,900 7,167
Total liabilities 117,460 110,932
Commitments and contingencies (Note 17)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,975,408    issued and 40,234,451 outstanding at December 31, 2019; 40,673,513    issued and 39,974,478 outstanding at December 31, 2018 40 40
Treasury stock, at cost, 740,957 and 699,035 shares at    December 31, 2019 and 2018, respectively (2,979) (2,839)
Additional paid-in capital 165,223 162,195
Retained earnings 81,900 50,277
Accumulated other comprehensive loss (41) (313)
Total stockholders’ equity 244,143 209,360
Total liabilities and stockholders’ equity 361,603 320,292
Operating right-of-use assets 28,178 0
Accrued Income Taxes, Current 542 0
Operating Lease, Liability, Current 13,108 0
Operating Lease, Liability, Noncurrent 15,469 0
Contract with Customer, Liability, Noncurrent $ 1,670 $ 0