Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income (loss)	$ (78,383)	$ 38,145
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	72,306	85,691
Non-cash operating lease expense	15,252	13,847
Stock-based compensation	20,638	21,064
Amortization of prepaid debt fees	3,029	3,686
Deferred taxes, net	(9,439)	4,990
Restructuring, non-cash	6,518	(2,147)
Other adjustments, net	3,856	(6,121)
Changes in operating assets and liabilities
Accounts receivable	82,087	(39,385)
Inventories	8,978	(15,762)
Other current assets	(12,862)	(10,494)
Other long-term assets	(2,547)	7,945
Accounts payable, other current liabilities, and taxes payable	(82,775)	(4,063)
Wages and benefits payable	(28,446)	30,220
Unearned revenue	15,098	6,746
Warranty	(10,894)	(5,506)
Other operating, net	10,860	(756)
Net cash provided by operating activities	70,571	128,100
Investing activities
Acquisitions of property, plant, and equipment	(36,297)	(44,570)
Other investing, net	3,573	9,977
Net cash used in investing activities	(33,472)	(34,593)
Financing activities
Proceeds from borrowings	400,000	50,000
Payments on debt	0	(100,313)
Issuance of common stock	5,059	7,117
Repurchase of common stock	0	(25,000)
Prepaid debt fees	(184)	(175)
Other financing, net	(2,285)	(5,221)
Net cash provided by (used in) financing activities	402,590	(73,592)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(3,426)	(543)
Increase in cash, cash equivalents, and restricted cash	436,263	19,372
Cash, cash equivalents, and restricted cash at beginning of period	149,904	122,328
Cash, cash equivalents, and restricted cash at end of period	586,167	141,700
Supplemental disclosure of cash flow information:
Income taxes, net	(349)	8,842
Interest	34,327	39,523
Payments for (Proceeds from) Businesses and Interest in Affiliates	(748)	0
Gain (Loss) on Disposition of Business	$ 57,295	$ 0