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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities    
Net loss $ (43,447) $ (67,836)
Adjustments to reconcile net loss to cash from operating activities    
Depreciation and amortization 49,155 57,162
Equity-based compensation expense 5,591 5,168
Amortization of deferred financing costs 177 0
Deferred tax provision 3,702 0
Provision for bad debts 85 41
Loss on disposal of assets 381 452
Changes in fair value of investments (1,879) (417)
Unrealized (gain) loss on derivative instruments 204 (765)
Other (373) 0
Changes in operating assets and liabilities    
Accounts receivable (14,334) (21,712)
Inventories (2,323) (1,461)
Other current assets 2,063 2,042
Other assets 111 324
Accounts payable and accrued liabilities (17,118) (10,192)
Deferred revenue 22 (424)
Other non-current liabilities 594 (244)
Net cash used in operating activities (17,389) (37,862)
Cash flows from investing activities    
Purchases of property, plant and equipment and intangibles (17,240) (11,265)
Proceeds from sale of assets 260 1,755
Proceeds from sale of investments 31,739 56,946
Purchase of investments (20,185) (42,279)
Net cash (used in) provided by investing activities (5,426) 5,157
Cash flows from financing activities    
Repayments of borrowings (3,492) (2,921)
Treasury shares withheld for taxes (1,542) (1,217)
Proceeds from the issuance of ESPP shares 692 562
Deferred financing costs (184) (48)
Net cash used in financing activities (4,526) (3,624)
Effect of exchange rate changes on cash (416) 2,078
Net decrease in cash, cash equivalents and restricted cash (27,757) (34,251)
Cash, cash equivalents and restricted cash at beginning of period 186,212 213,015
Cash, cash equivalents and restricted cash at end of period $ 158,455 $ 178,764