CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net income (loss)	$ (29,149)	$ 91,919
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	32,231	23,092
Stock-based compensation expense	10,477	9,442
Impairment and other charges	60,968	0
Gain on sale of equipment	(79)	(93)
Deferred income taxes	(31,529)	(3,435)
Changes in operating assets and liabilities:
Trade receivables, net	21,271	92,075
Inventories	32,596	(12,515)
Prepaids and other assets	17,308	34,350
Excess tax benefits of stock options and awards	0	(58)
Accounts payable and accrued expenses	(39,359)	(13,283)
Net cash provided by operating activities	74,735	221,494
Investing activities
Purchase of property, plant and equipment	(19,563)	(20,289)
Proceeds from sale of equipment	1,160	281
Acquisition of business, net of cash acquired	(21,289)	0
Net cash used in investing activities	(39,692)	(20,008)
Financing activities
Repurchase of common stock	0	(24,238)
Proceeds from exercise of stock options	455	940
Excess tax benefits of stock options and awards	0	58
Net cash provided by (used in) financing activities	455	(23,240)
Effect of exchange rate changes on cash activities	14,050	(16,952)
Increase (decrease) in cash and cash equivalents	49,548	161,294
Cash and cash equivalents at beginning of period	423,497	381,336
Cash and cash equivalents at end of period	$ 473,045	$ 542,630

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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