Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income (loss)	$ (145,270)	$ 16,014
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	31,072	14,378
Stock-based compensation	8,095	5,211
Amortization of prepaid debt fees	3,386	266
Deferred taxes, net	(16,508)	882
Restructuring, non-cash	47	0
Other adjustments, net	(106)	946
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(7,768)	13,119
Inventories	(253)	(11,274)
Other current assets	(8,849)	(11,169)
Other long-term assets	4,509	646
Accounts payable, other current liabilities, and taxes payable	7,826	28,277
Wages and benefits payable	16,438	(1,796)
Unearned revenue	23,317	14,020
Warranty	663	(2,303)
Other operating, net	58,953	(3,960)
Net cash provided by (used in) operating activities	(24,448)	63,257
Investing activities
Acquisitions of property, plant, and equipment	(17,433)	(9,122)
Business acquisitions, net of cash equivalents acquired	(802,488)	0
Other investing, net	100	(78)
Net cash used in investing activities	(819,821)	(9,200)
Financing activities
Proceeds from borrowings	555,938	0
Payments on debt	(32,395)	(2,813)
Issuance of common stock	3,384	405
Payments of Debt Issuance Costs	(24,042)	0
Other financing, net	(1,046)	155
Net cash provided by (used in) financing activities	501,839	(2,253)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	563	2,559
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(341,867)	54,363
Cash, cash equivalents, and restricted cash at end of period	143,951	187,928
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	145,468	187,928
Supplemental disclosure of cash flow information:
Income taxes, net	1,498	1,224
Interest	$ 6,878	$ 2,422