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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net loss $ (156,220,000) $ (235,329,000) $ (90,733,000)
Adjustments to reconcile net loss to cash from operating activities      
Depreciation and amortization 70,169,000 92,800,000 111,292,000
Equity-based compensation expense 11,010,000 11,280,000 10,621,000
Goodwill impairment 57,146,000 111,108,000 0
Loss on asset impairments and retirements 21,225,000 40,686,000 0
Amortization of deferred financing costs 388,000 371,000 58,000
Deferred tax provision (benefit) (625,000) 727,000 (14,634,000)
Provision for bad debts 938,000 1,281,000 159,000
(Gain) loss on disposal of assets (1,424,000) 1,037,000 (1,309,000)
Changes in fair value of investments (1,106,000) (2,747,000) 1,199,000
Unrealized (gain) loss on derivative instruments 0 222,000 (386,000)
Other (64,000) (1,522,000) 843,000
Changes in operating assets and liabilities, net of effects from acquisitions      
Accounts receivable 54,707,000 22,152,000 (63,654,000)
Inventories (1,573,000) (10,694,000) (2,917,000)
Other current assets 4,437,000 856,000 4,581,000
Other assets 848,000 (1,285,000) 258,000
Accounts payable and accrued liabilities (16,787,000) (3,937,000) 15,310,000
Deferred revenue (74,000) 545,000 (354,000)
Other noncurrent liabilities (3,344,000) (503,000) (2,978,000)
Net cash provided by (used in) operating activities 39,651,000 27,048,000 (32,644,000)
Cash flows from investing activities      
Purchase of property, plant and equipment and intangibles (28,473,000) (36,942,000) (19,734,000)
Purchase of property, plant and equipment from related parties 0 0 (36,737,000)
Proceeds from sale of assets and equipment 8,319,000 791,000 7,089,000
Purchase of investments (2,252,000) (20,122,000) (84,040,000)
Proceeds from sale of investments 2,832,000 46,739,000 143,825,000
Other (460,000) (512,000) 0
Net cash provided by (used in) investing activities (20,034,000) (10,046,000) 10,403,000
Cash flows from financing activities      
Repayments of borrowings (236,000) (5,627,000) (5,892,000)
Deferred financing costs 0 (184,000) (1,733,000)
Treasury shares withheld (1,282,000) (1,886,000) (1,636,000)
Treasury share repurchase (1,498,000) 0 0
Proceeds from the issuance of ESPP shares 934,000 1,752,000 1,315,000
Net cash used in financing activities (2,082,000) (5,945,000) (7,946,000)
Effect of exchange rate changes on cash (3,028,000) (529,000) 3,384,000
Net increase (decrease) in cash, cash equivalents and restricted cash 14,507,000 10,528,000 (26,803,000)
Cash, cash equivalents and restricted cash at beginning of period 196,740,000 186,212,000 213,015,000
Cash, cash equivalents and restricted cash at end of period $ 211,247,000 $ 196,740,000 $ 186,212,000