Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income (loss)	$ (96,581)	$ 60,249	$ 35,053
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	122,497	63,215	68,318
Stock-based compensation	31,263	21,407	18,035
Amortization of prepaid debt fees	7,046	1,067	1,076
Deferred taxes, net	(19,130)	50,667	13,790
Restructuring, non-cash	859	(2,297)	7,188
Other adjustments, net	1,452	3,673	4,309
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	15,524	(17,573)	(27,162)
Inventories	(25,613)	(16,242)	22,343
Other current assets	(23,589)	8,112	20,705
Other long-term assets	3,020	11,230	(339)
Accounts payables, other current liabilities, and taxes payable	20,101	78,463	(37,312)
Wages and benefits payable	(9,565)	1,926	7,808
Unearned revenue	27,584	(41,309)	(25,810)
Warranty	20,815	(10,554)	(10,246)
Other operating, net	34,072	(20,680)	18,086
Net cash provided by operating activities	109,755	191,354	115,842
Investing activities
Acquisitions of property, plant, and equipment	(59,952)	(49,495)	(43,543)
Business acquisitions, net of cash equivalents acquired	(803,075)	(99,386)	(951)
Other investing, net	369	702	(3,034)
Net cash used in investing activities	(862,658)	(148,179)	(47,528)
Financing activities
Proceeds from borrowings	778,938	335,000	15,877
Payments on debt	(363,359)	(29,063)	(79,119)
Issuance of common stock	9,171	3,609	2,891
Prepaid debt fees	(24,042)	0	0
Other financing, net	(4,887)	(7,587)	(2,672)
Net cash provided by (used in) financing activities	395,821	301,959	(63,023)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(7,925)	8,636	(2,744)
(Decrease) increase in cash, cash equivalents, and restricted cash	(365,007)	353,770	2,547
Cash, cash equivalents, and restricted cash at beginning of period	487,335	133,565	131,018
Cash, cash equivalents, and restricted cash at end of period	122,328	487,335	133,565
Supplemental disclosure of cash flow information:
Income taxes, net	13,771	28,969	24,287
Interest	$ 42,347	$ 10,106	$ 9,921