Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net loss	$ (19,875)	$ (78,383)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	64,252	72,306
Non-cash operating lease expense	12,962	15,252
Stock-based compensation	18,251	20,638
Amortization of prepaid debt fees	17,383	3,029
Deferred taxes, net	(5,170)	(9,439)
Loss on sale of business	28,274	57,295
Loss on extinguishment of debt	10,000	0
Restructuring, non-cash	951	6,518
Other adjustments, net	3,720	3,856
Changes in operating assets and liabilities, net of sale of business:
Accounts receivable	40,624	82,087
Inventories	2,150	8,978
Other current assets	26,072	(12,862)
Other long-term assets	5,058	(2,547)
Accounts payable, other current liabilities, and taxes payable	(27,124)	(82,775)
Wages and benefits payable	14,110	(28,446)
Unearned revenue	(13,158)	15,098
Warranty	(5,969)	(10,894)
Other operating, net	(31,364)	10,860
Net cash provided by operating activities	141,147	70,571
Investing activities
Net proceeds (payments) related to the sale of business	3,142	(748)
Acquisitions of property, plant, and equipment	(27,781)	(36,297)
Other investing, net	2,820	3,573
Net cash used in investing activities	(21,819)	(33,472)
Financing activities
Proceeds from borrowings	460,000	400,000
Payments on debt	(946,094)	0
Issuance of common stock	4,351	5,059
Proceeds from common stock offering	389,419	0
Proceeds from sale of warrants	45,349	0
Purchases of convertible note hedge contracts	(84,139)	0
Prepaid debt fees	(12,021)	(184)
Other financing, net	6,327	(2,285)
Net cash (used in) provided by financing activities	(136,808)	402,590
Effect of foreign exchange rate changes on cash and cash equivalents	(762)	(3,426)
Increase (decrease) in cash and cash equivalents	(18,242)	436,263
Cash and cash equivalents at beginning of period	206,933	149,904
Cash and cash equivalents at end of period	188,691	586,167
Supplemental disclosure of cash flow information:
Income taxes, net	5,989	(349)
Interest	$ 8,655	$ 34,327