Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net income (loss)	$ 9,162	$ (149)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	24,031	28,427
Non-cash operating lease expense	5,496	4,910
Stock-based compensation	8,482	7,205
Amortization of prepaid debt fees	1,007	1,200
Deferred taxes, net	4,062	(430)
Restructuring, non-cash	(955)	96
Other adjustments, net	(874)	44
Changes in operating assets and liabilities, net of acquisitions
Accounts receivable	1,185	(37,977)
Inventories	(543)	(1,659)
Other current assets	(4,526)	(11,030)
Other long-term assets	(6,501)	334
Accounts payable, other current liabilities, and taxes payable	135	12,312
Wages and benefits payable	(19,977)	8,465
Unearned revenue	17,395	8,235
Warranty	(4,250)	(2,569)
Other operating, net	(14,435)	7,510
Net cash provided by operating activities	18,894	24,924
Investing activities
Acquisitions of property, plant, and equipment	(12,602)	(11,415)
Other investing, net	3,345	299
Net cash used in investing activities	(9,257)	(11,116)
Financing activities
Proceeds from borrowings	400,000	30,000
Payments on debt	0	(44,063)
Issuance of common stock	2,911	1,758
Repurchase of common stock	(664)	(8,534)
Prepaid debt fees	(175)	(175)
Other financing, net	(335)	(2,229)
Net cash provided by (used in) financing activities	401,737	(23,243)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(6,758)	72
Increase (decrease) in cash, cash equivalents, and restricted cash	404,616	(9,363)
Cash, cash equivalents, and restricted cash at beginning of period	149,904	122,328
Cash, cash equivalents, and restricted cash at end of period	554,520	112,965
Supplemental disclosure of cash flow information:
Income taxes, net	(5,370)	3,241
Interest	$ 14,804	$ 16,628