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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities    
Net loss $ (148,014,000) $ (67,236,000)
Adjustments to reconcile net loss to cash from operating activities    
Depreciation and amortization 52,920,000 70,637,000
Equity-based compensation expense 8,434,000 8,238,000
Goodwill impairment 57,146,000 0
Loss on asset impairments and retirements 20,532,000 4,268,000
Amortization of deferred financing costs 291,000 274,000
Deferred tax provision (benefit) (1,783,000) 3,887,000
Provision for (recovery of) bad debts 980,000 (27,000)
(Gain) loss on disposal of assets (898,000) 984,000
Changes in fair value of investments 218,000 (1,935,000)
Unrealized gain on derivative instruments 0 (349,000)
Other (380,000) (566,000)
Changes in operating assets and liabilities    
Accounts receivable 63,307,000 9,872,000
Inventories (3,625,000) (14,191,000)
Other current assets 2,567,000 2,537,000
Other assets 667,000 179,000
Accounts payable and accrued liabilities (22,486,000) (7,844,000)
Deferred revenue (513,000) 110,000
Other non-current liabilities (4,048,000) (353,000)
Net cash provided by operating activities 25,315,000 8,485,000
Cash flows from investing activities    
Purchases of property, plant and equipment and intangibles (25,722,000) (26,979,000)
Proceeds from sale of assets 7,037,000 353,000
Proceeds from sale of investments 2,832,000 46,739,000
Purchase of investments 0 (20,304,000)
Other (356,000) 0
Net cash used in investing activities (16,209,000) (191,000)
Cash flows from financing activities    
Repayments of borrowings 0 (5,110,000)
Treasury shares withheld for taxes (1,125,000) (1,874,000)
Treasury share repurchase (1,498,000) 0
Proceeds from the issuance of ESPP shares 934,000 1,752,000
Deferred financing costs 0 (184,000)
Net cash used in financing activities (1,689,000) (5,416,000)
Effect of exchange rate changes on cash 3,267,000 2,684,000
Net increase in cash, cash equivalents and restricted cash 10,684,000 5,562,000
Cash, cash equivalents and restricted cash at beginning of period 196,740,000 186,212,000
Cash, cash equivalents and restricted cash at end of period $ 207,424,000 $ 191,774,000