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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net income $ 18,309 $ 10,996
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 12,501 7,359
Amortization of intangible assets 837 284
Asset retirement obligation settlement (1,883) (1,783)
Amortization of deferred financing cost 117 138
Accretion of debt discount 331 116
Deferred income taxes 4,287 2,647
Stock-based compensation, net 1,544 1,298
Employee stock purchase plan compensation 18 0
Change in contingent consideration fair value (1,542) 0
Changes in assets and liabilities, net of effects of acquisitions:    
Accounts receivable (26,663) (597)
Unbilled receivables 512 (3,715)
Inventories 6,194 (315)
Prepaid expenses and other assets 1,587 (2,975)
Deferred revenue (694) 4,805
Accounts payable (1,977) (3,057)
Accrued and other expenses 3,925 3,712
Net cash provided by operating activities 17,403 18,913
Investing activities:    
Acquisition of businesses, net of cash acquired 0 (29,878)
Purchases of property, plant and equipment (13,869) (66,841)
Net cash used in investing activities (13,869) (96,719)
Financing activities:    
Proceeds from the issuance of notes payable 4,696 0
Repayments of notes payable (734) (288)
Payments under equipment financing obligations (50) (140)
Payment of deferred financing and debt issuance costs (835) (146)
Proceeds from revolving credit facility 22,750 59,000
Repayment of revolving credit facility (28,250) (14,000)
Payment of contingent consideration (1,225) 0
Proceeds from equity issuance 40 71
Purchase of treasury stock (139) (173)
Net cash (used in) provided by financing activities (3,747) 44,324
Effect of exchange rate changes on cash and cash equivalents 0 0
Net decrease in cash and cash equivalents (213) (33,482)
Cash and cash equivalents at beginning of year 1,466 35,227
Cash and cash equivalents at end of period 1,253 1,745
Non-cash investing activities:    
Contingent consideration 0 9,200
Asset retirement obligation 3,301 2,086
Non-cash financing activities:    
Capitalized expenditures in accounts payable and accrued expenses $ 1,237 $ 6,585