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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities:    
Net income $ 23,121 $ 10,648
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 12,141 5,210
Amortization of intangible assets 572 0
Asset retirement obligation settlement (2,219) 0
Loss on disposal of assets 253 187
Amortization of deferred financing cost 223 339
Accretion of debt discount 180 0
Deferred income taxes 7,258 3,804
Stock-based compensation 2,133 1,378
Employee stock purchase plan compensation 56 19
Change in contingent consideration fair value (2,100) 0
Changes in assets and liabilities, net of effects of acquisitions:    
Accounts receivable (6,386) (15,148)
Unbilled receivables (23) (639)
Inventories (5,170) 5,834
Prepaid expenses and other assets (3,087) (1,222)
Deferred revenue 4,030 (1,615)
Accounts payable (2,517) 4,561
Accrued and other expenses 5,258 2,261
Income taxes payable 0 (7,058)
Net cash provided by operating activities 33,723 8,559
Investing activities:    
Acquisition of businesses, net of cash acquired (29,921) 0
Purchases of property, plant and equipment (81,654) (27,582)
Proceeds from disposal of assets 22 14
Net cash used in investing activities (111,553) (27,568)
Financing activities:    
Repayments of notes payable (288) (282)
Payments under equipment financing obligations (166) (276)
Payment of deferred financing and debt issuance costs (210) (193)
Proceeds from revolving credit facility 71,500 0
Repayment of revolving credit facility (27,000) 0
Proceeds from equity issuance 127 26,251
Payment of equity transaction costs 0 (2,083)
Purchase of treasury stock (174) (127)
Net cash provided by financing activities 43,789 23,290
Effect of exchange rate changes on cash, cash equivalents and restricted cash 0 0
Net (decrease) increase in cash, cash equivalents and restricted cash (34,041) 4,281
Cash and cash equivalents and restricted cash at beginning of year 35,227 47,534
Cash and cash equivalents and restricted cash at end of period 1,186 51,815
Supplemental disclosure of cash flow information    
Cash paid for interest 870 145
Cash paid for taxes 725 7,657
Non-cash investing activities:    
Contingent consideration 9,200 0
Asset retirement obligation 1,561 0
Non-cash financing activities:    
Write-off of remaining balance of returned equipment under capital lease 398 194
Capitalized expenditures in accounts payable and accrued expenses $ 7,920 $ 11,924