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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income $ 10,996 $ 3,600
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 7,359 3,412
Amortization of intangible assets 284 0
Asset retirement obligation settlement (1,783) 0
Loss (gain) on disposal of assets 0 157
Amortization of deferred financing cost 138 222
Accretion of debt discount 116 0
Deferred income taxes 2,647 4,158
Stock-based compensation 1,298 760
Changes in assets and liabilities, net of effects of acquisitions:    
Accounts receivable (597) (9,497)
Unbilled receivables (3,715) 276
Inventories (315) 4,555
Prepaid expenses and other assets (2,975) (3,415)
Deferred revenue 4,805 (1,610)
Accounts payable (3,057) 13
Accrued and other expenses 3,636 5,091
Income taxes payable 0 (7,058)
Net cash provided by operating activities 18,837 664
Investing activities:    
Acquisition of businesses, net of cash acquired (29,878) 0
Purchases of property, plant and equipment (66,841) (7,729)
Proceeds from disposal of assets 0 14
Net cash used in investing activities (96,719) (7,715)
Financing activities:    
Repayments of notes payable (288) (282)
Payments under equipment financing obligations (140) (208)
Payment of deferred financing costs (146) (193)
Proceeds from revolving credit facility 59,000 0
Repayment of revolving credit facility (14,000) 0
Proceeds from equity issuance 71 26,251
Payment of equity transaction costs 0 (2,083)
Purchase of treasury stock (173) (127)
Net cash provided by financing activities 44,324 23,358
Effect of exchange rate changes on cash, cash equivalents and restricted cash 76 0
Net (decrease) increase in cash, cash equivalents and restricted cash (33,482) 16,307
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 1,745 63,841
Supplemental disclosure of cash flow information    
Cash paid for interest 650 94
Cash paid for taxes 654 7,596
Non-cash investing activities:    
Contingent consideration 9,200 0
Asset retirement obligation 2,086 0
Non-cash financing activities:    
Capitalized expenditures in accounts payable and accrued expenses $ 6,585 $ 3,006