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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 1,253 $ 1,466
Accounts receivable, net 45,652 18,989
Unbilled receivables 7,311 7,823
Inventories 12,381 18,575
Prepaid expenses and other current assets 1,902 3,243
Total current assets 68,499 50,096
Property, plant and equipment, net 250,978 248,396
Operating right-of-use assets 32,417 0
Intangible assets, net 17,233 18,068
Other assets 3,374 3,732
Total assets 372,501 320,292
Current liabilities:    
Accounts payable 8,050 11,336
Accrued and other expenses 10,237 8,392
Deferred revenue 3,401 4,095
Current portion of long-term debt 40,238 829
Current portion of operating lease liabilities 13,339 0
Total current liabilities 75,265 24,652
Long-term debt, net of current portion 6,396 47,893
Long-term operating lease liabilities, net of current portion 19,702 0
Long-term deferred tax liabilities, net 22,185 17,898
Asset retirement obligation 15,185 13,322
Contingent consideration 4,400 7,167
Total liabilities 143,133 110,932
Commitments and contingencies (Note 16)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,949,849 issued and 40,209,409 outstanding at June 30, 2019; 40,673,513 issued and 39,974,478 outstanding at December 31, 2018 40 40
Treasury stock, at cost, 740,440 and 699,035 shares at June 30, 2019 and December 31, 2018, respectively (2,978) (2,839)
Additional paid-in capital 163,797 162,195
Retained earnings 68,586 50,277
Accumulated other comprehensive loss (77) (313)
Total stockholders’ equity 229,368 209,360
Total liabilities and stockholders’ equity $ 372,501 $ 320,292