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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities:    
Net income $ 29,235 $ 23,121
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 19,309 12,141
Impairment of intangible asset 7,628 0
Amortization of intangible assets 1,199 572
Asset retirement obligation settlement (2,348) (2,219)
(Gain) loss on disposal of assets (41) 253
Amortization of deferred financing cost 172 223
Accretion of debt discount 517 181
Deferred income taxes 6,787 7,258
Stock-based compensation, net 2,196 2,133
Employee stock purchase plan compensation 30 56
Change in contingent consideration fair value (2,757) (2,100)
Changes in assets and liabilities, net of effects of acquisitions:    
Accounts receivable (39,760) (6,386)
Unbilled receivables 6,634 (23)
Inventories 2,649 (5,170)
Prepaid expenses and other assets 1,035 (3,087)
Deferred revenue 4,396 4,030
Accounts payable (956) (2,517)
Accrued and other expenses 4,403 5,257
Net cash provided by operating activities 40,328 33,723
Investing activities:    
Acquisition of businesses, net of cash acquired 0 (29,921)
Purchases of property, plant and equipment (19,518) (81,654)
Proceeds from disposal of assets 0 22
Net cash used in investing activities (19,518) (111,553)
Financing activities:    
Proceeds from the issuance of notes payable 6,120 0
Repayments of notes payable (1,461) (288)
Payments under equipment financing obligations (79) (166)
Payment of deferred financing and debt issuance costs (1,087) (210)
Proceeds from revolving credit facility 37,750 71,500
Repayment of revolving credit facility (59,750) (27,000)
Payment of contingent consideration (1,610) 0
Proceeds from equity issuance 78 127
Purchase of treasury stock (139) (174)
Net cash (used in) provided by financing activities (20,178) 43,789
Effect of exchange rate changes on cash and cash equivalents 0 0
Net decrease in cash and cash equivalents 632 (34,041)
Cash and cash equivalents at beginning of year 1,466 35,227
Cash and cash equivalents at end of period 2,098 1,186
Non-cash investing activities:    
Contingent consideration 0 9,200
Asset retirement obligation 3,301 1,561
Non-cash financing activities:    
Write-off of remaining balance of returned equipment under capital lease 0 398
Capitalized expenditures in accounts payable and accrued expenses $ 2,138 $ 7,920