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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |
Net income (loss) | $ 103,602 | $ (98,933) | $ (160,500)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation, amortization, and accretion | 33,532 | 118,747 | 124,278
(Gain on sale) or loss on disposal of discontinued operations | (120,137) | 0 | 7,500
Impairments and other charges | 581 | 20,940 | 95,196
Impairment of goodwill | 0 | 0 | 25,784
Unrealized loss on CSI Compressco units | 2,227 | 0 | 0
Realized gain on sale of Standard Lithium shares | (15,479) | 0 | 0
Equity-based compensation expense | 4,664 | 6,616 | 8,127
(Recovery of) provision for doubtful accounts | (654) | 6,857 | 5,039
Amortization and expense of financing costs | 3,091 | 5,252 | 4,782
CSI Compressco debt exchange expenses | 0 | 4,892 | 0
CSI Compressco Series A Preferred Unit distributions and adjustments | 0 | 0 | (3,574)
Gain on sale of assets | (482) | (4,668) | (2,333)
Other non-cash charges and credits | (805) | (706) | (4,692)
Changes in operating assets and liabilities, net of assets acquired: |  |  |
Accounts receivable | (27,795) | 62,569 | 6,471
Inventories | 5,387 | 16,983 | (2,770)
Prepaid expenses and other current assets | (6,533) | 1,672 | 579
Trade accounts payable and accrued expenses | 27,006 | (62,274) | (16,545)
Other | (3,548) | (1,035) | (4,258)
Net cash provided by operating activities | 4,657 | 76,912 | 90,232
Investing activities: |  |  |
Purchases of property, plant, and equipment, net | (20,533) | (29,386) | (108,273)
Acquisition of businesses, net of cash acquired | 0 | 0 | (12,024)
Purchase of CarbonFree convertible note | (5,000) | 0 | 0
Proceeds from sale of investment | 17,627 | 0 | 0
Proceeds from sale of property, plant, and equipment | 1,687 | 36,168 | 12,885
Proceeds from insurance recoveries associated with damaged equipment | 110 | 643 | 1,771
Other investing activities | 934 | (1,387) | (801)
Net cash provided by (used in) investing activities | (5,175) | 6,038 | (106,442)
Financing activities: |  |  |
Proceeds from long-term debt | 1,614 | 477,647 | 282,590
Principal payments on long-term debt | (50,477) | (487,574) | (258,217)
Distributions to CSI Compressco public unitholders | 0 | (1,244) | (1,233)
Redemptions of CSI Compressco Series A Preferred | 0 | 0 | (28,049)
Debt issuance costs and other financing activities | (1,191) | (6,458) | (1,016)
Net cash used in financing activities | (50,054) | (17,629) | (5,925)
Effect of exchange rate changes on cash | (1,771) | 805 | (199)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | (52,343) | 66,126 | (22,334)
Cash and cash equivalents and restricted cash at beginning of period | 83,894 | 17,768 | 40,102
Cash and cash equivalents at beginning of period associated with discontinued operations | 16,577 | 2,370 | 15,858
Cash and cash equivalents and restricted cash at beginning of period associated with continuing operations | 67,317 | 15,398 | 24,244
Cash and cash equivalents and restricted cash at end of period | 31,551 | 83,894 | 17,768
Cash and cash equivalents and restricted cash at end of period associated with discontinued operations | 0 | 16,577 | 2,370
Cash and cash equivalents and restricted cash at end of period associated with continuing operations | $ 31,551 | $ 67,317 | $ 15,398

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