Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net income (loss)	$ 19,968	$ (141,497)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of intangible assets	57,068	61,979
Amortization of operating lease right-of-use assets	9,481	0
Stock-based compensation	13,783	16,619
Amortization of prepaid debt fees	2,402	4,602
Deferred taxes, net	2,076	(15,319)
Restructuring, non-cash	(5,295)	624
Other adjustments, net	(3,471)	1,205
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(29,121)	12,804
Inventories	(9,202)	3,385
Other current assets	(14,413)	(1,921)
Other long-term assets	6,616	4,514
Accounts payable, other current liabilities, and taxes payable	(2,801)	(16,994)
Wages and benefits payable	13,484	762
Unearned revenue	14,961	31,156
Warranty	(3,270)	3,756
Other operating, net	5,797	51,204
Net cash provided by operating activities	78,063	16,879
Investing activities
Acquisitions of property, plant, and equipment	(26,511)	(29,309)
Business acquisitions, net of cash equivalents acquired	0	(802,488)
Other investing, net	9,773	(543)
Net cash used in investing activities	(16,738)	(832,340)
Financing activities
Proceeds from borrowings	50,000	761,938
Payments on debt	(72,188)	(242,234)
Issuance of common stock	4,001	4,927
Payments for Repurchase of Common Stock	25,000	0
Prepaid debt fees	(175)	(24,042)
Other financing, net	(3,165)	(2,580)
Net cash provided by (used in) financing activities	(46,527)	498,009
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	727	(4,841)
Increase (decrease) in cash, cash equivalents, and restricted cash	15,525	(322,293)
Cash, cash equivalents, and restricted cash at beginning of period	122,328	487,335
Cash, cash equivalents, and restricted cash at end of period	137,853	165,042
Supplemental disclosure of cash flow information:
Income taxes, net	6,571	3,426
Interest	$ 23,333	$ 15,383