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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities:    
Net income $ 4,556 $ 18,309
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 10,697 12,501
Amortization of intangible assets 398 837
Asset retirement obligation settlement 0 (1,883)
Gain on disposal of assets 275 0
Amortization of deferred financing cost 53 117
Accretion of debt discount 92 331
Deferred income taxes 1,004 4,287
Stock-based compensation, net 1,968 1,544
Employee stock purchase plan compensation 25 18
Change in contingent consideration fair value (1,020) (1,542)
Imputed interest 61 0
Changes in assets and liabilities:    
Accounts receivable 2,957 (26,663)
Unbilled receivables 4,717 512
Inventories 1,128 6,194
Prepaid expenses and other assets 460 1,587
Deferred revenue (2,196) (694)
Accounts payable (361) (1,977)
Accrued and other expenses (2,618) 3,925
Income taxes payable 3,646 0
Net cash provided by operating activities 25,842 17,403
Investing activities:    
Purchases of property, plant and equipment (6,423) (13,869)
Net cash used in investing activities (6,423) (13,869)
Financing activities:    
Proceeds from the issuance of notes payable 952 4,696
Repayments of notes payable (2,482) (734)
Payments under equipment financing obligations (56) (50)
Payment of deferred financing and debt issuance costs (20) (835)
Proceeds from revolving credit facility 6,000 22,750
Repayment of revolving credit facility (8,500) (28,250)
Payment of contingent consideration (310) (1,225)
Proceeds from equity issuance 46 40
Purchase of treasury stock (1,045) (139)
Net cash provided by financing activities (5,415) (3,747)
Net increase in cash and cash equivalents 14,004 (213)
Cash and cash equivalents at beginning of year 2,639 1,466
Cash and cash equivalents at end of period 16,643 1,253
Noncash Investing and Financing Items [Abstract]    
Asset retirement obligation 0 3,301
Capitalized expenditures in accounts payable and accrued expenses $ 225 $ 1,237