Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income (loss)	$ (141,497)	$ 31,021
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	61,979	29,468
Stock-based compensation	16,619	10,135
Amortization of prepaid debt fees	4,602	533
Deferred taxes, net	(15,319)	7,077
Restructuring, non-cash	624	80
Other adjustments, net	1,205	2,395
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	12,804	(2,032)
Inventories	3,385	(29,470)
Other current assets	(1,921)	(3,905)
Other long-term assets	4,514	2,186
Accounts payable, other current liabilities, and taxes payable	(16,994)	36,861
Wages and benefits payable	762	12,299
Unearned revenue	31,156	6,701
Warranty	3,756	(4,825)
Other operating, net	51,204	(5,080)
Net cash provided by operating activities	16,879	93,444
Investing activities
Acquisitions of property, plant, and equipment	(29,309)	(21,898)
Business acquisitions, net of cash equivalents acquired	(802,488)	(99,477)
Other investing, net	(543)	(456)
Net cash used in investing activities	(832,340)	(121,831)
Financing activities
Proceeds from borrowings	611,938	35,000
Payments on debt	(92,234)	(20,625)
Issuance of common stock	4,927	2,198
Prepaid debt fees	(24,042)	0
Other financing, net	(2,580)	952
Net cash provided by financing activities	498,009	17,525
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(4,841)	5,177
Decrease in cash, cash equivalents, and restricted cash	(322,293)	(5,685)
Cash, cash equivalents, and restricted cash at beginning of period	487,335	133,565
Cash, cash equivalents, and restricted cash at end of period	165,042	127,880
Supplemental disclosure of cash flow information:
Income taxes, net	3,426	14,480
Interest	$ 15,383	$ 5,021