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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities:    
Net income $ 40,839 $ 29,235
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 16,092 19,309
Impairment loss 0 7,628
Amortization of intangible assets 596 1,199
Asset retirement obligation settlement 0 (2,348)
Loss (gain) on disposal of assets 299 (41)
Amortization of deferred financing cost 79 172
Accretion of debt discount 138 517
Deferred income taxes 238 6,787
Stock-based compensation, net 2,909 2,196
Employee stock purchase plan compensation 29 30
Change in contingent consideration fair value (1,020) (2,757)
Gain on bargain purchase, net of cash acquired (39,580) 0
Changes in assets and liabilities:    
Accounts receivable (7,029) (39,760)
Unbilled receivables (4,491) 6,634
Inventories 306 2,649
Prepaid expenses and other assets 3,751 1,035
Deferred revenue 3,912 4,396
Accounts payable (205) (956)
Accrued and other expenses (607) 4,403
Income taxes payable 5,968 0
Net cash provided by operating activities 22,224 40,328
Investing activities:    
Purchases of property, plant and equipment (7,444) (19,518)
Proceeds from disposal of assets 51 0
Net cash used in investing activities (7,393) (19,518)
Financing activities:    
Proceeds from the issuance of notes payable 952 6,120
Repayments of notes payable (3,527) (1,461)
Payments under equipment financing obligations (87) (79)
Payment of deferred financing and debt issuance costs (20) (1,087)
Proceeds from revolving credit facility 6,000 37,750
Repayment of revolving credit facility (8,500) (59,750)
Payment of contingent consideration (310) (1,610)
Proceeds from equity issuance 62 78
Purchase of treasury stock (1,046) (139)
Net cash used in financing activities (6,476) (20,178)
Net increase in cash and cash equivalents 8,355 632
Cash and cash equivalents at beginning of year 2,639 1,466
Cash and cash equivalents at end of period 10,994 2,098
Noncash Investing and Financing Items [Abstract]    
Asset retirement obligation 0 3,301
Capitalized expenditures in accounts payable and accrued expenses $ 157 $ 2,138