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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net loss $ (63,993) $ (468,383) $ (231,808)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization expense 80,741 98,543 123,319
Impairments of goodwill 0 406,056 165,000
Impairments of inventories 3,581 31,151 0
Impairments of fixed and lease assets 4,166 12,447 33,697
Stock-based compensation expense 7,879 8,431 16,768
Amortization of debt discount and deferred financing costs 2,314 7,736 7,884
Deferred income tax benefit (8,639) (24,404) (15,469)
Release of foreign currency translation adjustments on liquidation of an international operation 9,320 0 0
Gains on extinguishment of 1.50% convertible senior notes (4,022) (10,721) 0
Gains on disposals of assets (6,472) (2,444) (4,291)
Other, net (511) 4,668 3,079
Changes in operating assets and liabilities:      
Accounts receivable (24,407) 63,876 50,257
Inventories (10,334) 17,578 (10,774)
Accounts payable and accrued liabilities 17,727 (37,315) (6,173)
Deferred revenue (148) 25,549 3,470
Other operating assets and liabilities, net (8) (13) 2,473
Net cash flows provided by operating activities 7,194 132,755 137,432
Cash flows from investing activities:      
Capital expenditures (17,517) (12,749) (56,116)
Proceeds from disposition of property and equipment 11,527 9,601 6,046
Other, net (636) (581) (1,912)
Net cash flows used in investing activities (6,626) (3,729) (51,982)
Cash flows from financing activities:      
Revolving credit facility borrowings 12,873 72,173 246,828
Revolving credit facility repayments (31,873) (105,104) (331,041)
Issuance of 4.75% convertible senior notes 135,000 0 0
Purchases of 1.50% convertible senior notes (125,952) (20,078) (6,724)
Other debt and finance lease repayments, net (230) (8,222) (500)
Payment of financing costs (7,791) (1,041) (16)
Purchases of treasury stock 0 0 (757)
Shares added to treasury stock as a result of net share settlements due to vesting of stock awards (1,595) (2,745) (3,698)
Net cash flows used in financing activities (19,568) (65,017) (95,908)
Effect of exchange rate changes on cash and cash equivalents (159) (491) (365)
Net change in cash and cash equivalents (19,159) 63,518 (10,823)
Cash and cash equivalents, beginning of period 72,011 8,493 19,316
Cash and cash equivalents, end of period 52,852 72,011 8,493
Cash paid (received) for:      
Interest 6,532 6,402 9,626
Income taxes, net $ 152 $ (36,766) $ (1,303)