Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net income (loss)	$ 38,145	$ (121,710)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of intangible assets	85,691	92,428
Amortization of operating lease right-of-use assets	13,847	0
Stock-based compensation	21,064	23,069
Amortization of prepaid debt fees	3,686	5,825
Deferred taxes, net	4,990	(13,141)
Restructuring, non-cash	(2,147)	569
Other adjustments, net	(6,121)	(30)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(39,385)	7,774
Inventories	(15,762)	(10,072)
Other current assets	(10,494)	(9,797)
Other long-term assets	7,945	3,817
Accounts payable, other current liabilities, and taxes payable	(4,063)	4,494
Wages and benefits payable	30,220	2,166
Unearned revenue	6,746	27,869
Warranty	(5,506)	3,167
Other operating, net	(756)	50,955
Net cash provided by operating activities	128,100	67,383
Investing activities
Acquisitions of property, plant, and equipment	(44,570)	(42,493)
Business acquisitions, net of cash equivalents acquired	0	(803,075)
Other investing, net	9,977	(181)
Net cash used in investing activities	(34,593)	(845,749)
Financing activities
Proceeds from borrowings	50,000	761,938
Payments on debt	(100,313)	(332,297)
Issuance of common stock	7,117	8,283
Repurchase of common stock	(25,000)	0
Prepaid debt fees	(175)	(24,042)
Other financing, net	(5,221)	(5,526)
Net cash provided by (used in) financing activities	(73,592)	408,356
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(543)	(6,175)
Increase (decrease) in cash, cash equivalents, and restricted cash	19,372	(376,185)
Cash, cash equivalents, and restricted cash at beginning of period	122,328	487,335
Cash, cash equivalents, and restricted cash at end of period	141,700	111,150
Supplemental disclosure of cash flow information:
Income taxes, net	8,842	6,367
Interest	$ 39,523	$ 34,539