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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net loss $ (42,073) $ (26,663)
Adjustments to reconcile net loss to cash used in operating activities    
Depreciation and amortization 28,300 31,099
Equity-based compensation expense 2,280 5,701
Amortization of deferred financing costs 0 205
Deferred tax benefit 0 (11,060)
Provision (recovery) for bad debts 103 (91)
(Gain) loss on disposal of assets 235 (1,472)
Changes in fair value of investments 191 (1,013)
Realized loss on sale of investment 0 478
Unrealized (gain) loss on derivatives (561) 456
Other 0 (1,876)
Changes in operating assets and liabilities    
Accounts receivable (4,426) (10,030)
Inventories (2,469) 4,732
Other current assets 1,042 1,045
Other assets 270 547
Accounts payable and accrued liabilities (3,295) 4,486
Deferred revenue (410) (3,716)
Other non-current liabilities (96) (2,263)
Net cash used in operating activities (20,909) (9,435)
Cash flows from investing activities    
Purchases of property, plant and equipment and intangibles (6,323) (11,720)
Proceeds from sale of assets 1,639 1,636
Proceeds from sale of investments 30,969 2,899
Purchase of investments (26,428) (59)
Net cash used in investing activities (143) (7,244)
Cash flows from financing activities    
Repayments of borrowings (1,455) (72)
Proceeds from borrowings 0 4
Dividends paid on common stock 0 (16,703)
Net treasury shares withheld for taxes (1,035) (1,802)
Proceeds from the issuance of ESPP shares 561 526
Net cash used in financing activities (1,929) (18,047)
Effect of exchange rate changes on cash (1,255) (860)
Net decrease in cash and cash equivalents (24,236) (35,586)
Cash and cash equivalents at beginning of period 213,015 319,526
Cash and cash equivalents at end of period 188,779 283,940
Non-cash transactions:    
Change in accounts payable and accrued liabilities related to capital expenditures (2,538) 2,430
Net transfers from inventory to property, plant and equipment $ (720) $ 0