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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net loss $ (51,583) $ (148,014)
Adjustments to reconcile net loss to cash from operating activities    
Depreciation and amortization 45,531 52,920
Equity-based compensation expense 9,604 8,434
Goodwill impairment 0 57,146
Loss on asset impairments and retirements 307 20,532
Amortization of deferred financing costs 291 291
Deferred tax provision (benefit) 1,474 (1,783)
Provision for bad debts 852 980
Gain on disposal of assets (1,733) (898)
Changes in fair value of investments (863) 218
Other 0 (380)
Changes in operating assets and liabilities    
Accounts receivable (23,149) 63,307
Inventories (7,969) (3,625)
Other current assets 1,137 2,567
Other assets 756 667
Accounts payable and accrued liabilities 15,910 (22,486)
Deferred revenue (498) (513)
Other non-current liabilities (2,263) (4,048)
Net cash provided by (used in) operating activities (12,196) 25,315
Cash flows from investing activities    
Purchases of property, plant and equipment and intangibles (7,613) (25,722)
Proceeds from sale of assets 4,300 7,037
Proceeds from sale of investments 11,603 2,832
Purchase of investments (1,294) 0
Investment in intellectual property (1,608) 0
Other (799) (356)
Net cash provided by (used in) investing activities 4,589 (16,209)
Cash flows from financing activities    
Repayments of borrowings (1,674) 0
Treasury shares withheld for taxes (1,930) (1,125)
Treasury share repurchase 0 (1,498)
Proceeds from the issuance of ESPP shares 933 934
Net cash used in financing activities (2,671) (1,689)
Effect of exchange rate changes on cash 3,770 3,267
Net increase (decrease) in cash, cash equivalents and restricted cash (6,508) 10,684
Cash, cash equivalents and restricted cash at beginning of period 211,247 196,740
Cash, cash equivalents and restricted cash at end of period $ 204,739 $ 207,424