Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income (loss)	$ (121,710)	$ 57,875
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	92,428	46,000
Stock-based compensation	23,069	15,254
Amortization of prepaid debt fees	5,825	800
Deferred taxes, net	(13,141)	7,615
Restructuring, non-cash	569	(720)
Other adjustments, net	(30)	3,111
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	7,774	2,537
Inventories	(10,072)	(30,843)
Other current assets	(9,797)	(23,492)
Other long-term assets	3,817	10,460
Accounts payable, other current liabilities, and taxes payable	4,494	34,987
Wages and benefits payable	2,166	6,218
Unearned revenue	27,869	(5,679)
Warranty	3,167	(10,285)
Other operating, net	50,955	663
Net cash provided by operating activities	67,383	114,501
Investing activities
Acquisitions of property, plant, and equipment	(42,493)	(33,493)
Business acquisitions, net of cash equivalents acquired	(803,075)	(98,848)
Other investing, net	(181)	10
Net cash used in investing activities	(845,749)	(132,331)
Financing activities
Proceeds from borrowings	611,938	35,000
Payments on debt	(182,297)	(24,844)
Issuance of common stock	8,283	2,797
Prepaid debt fees	(24,042)	0
Other financing, net	(5,526)	1,216
Net cash provided by financing activities	408,356	14,169
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(6,175)	7,680
(Decrease) increase in cash, cash equivalents, and restricted cash	(376,185)	4,019
Cash, cash equivalents, and restricted cash at beginning of period	487,335	133,565
Cash, cash equivalents, and restricted cash at end of period	111,150	137,584
Supplemental disclosure of cash flow information:
Income taxes, net	6,367	25,423
Interest	$ 34,539	$ 7,629