CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 41,788	$ 68,439
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions
Depreciation	45,685	45,409
Amortization of intangible assets	8,242	9,020
Share-based compensation expense	12,394	9,775
Deferred income taxes	(2,317)	(74)
Other	1,084	(696)
Changes in operating assets:
Change in accounts receivable	(7,573)	(11,993)
Change in inventory	(19,770)	577
Change in other operating assets	7,422	(6,412)
Changes in operating liabilities:
Change in accounts payable	16,767	(7,036)
Change in accrued liabilities	(6,429)	4,454
Change in income tax payable	(10,159)	1,247
Change in other operating liabilities	(400)	(2,222)
Net cash flows provided by operating activities	86,734	110,488
Cash flows from investing activities
Acquisitions, net of cash received	591	(33,029)
Purchases of property, plant and equipment	(30,728)	(50,698)
Proceeds from maturity of short-term investments	6,186	9,843
Purchases of short-term investments	(5,051)	(9,000)
Additional acquisition of noncontrolling interest	(6,130)
Other	1,084	367
Net cash and cash equivalents used in investing activities	(34,048)	(82,517)
Cash flows from financing activities
Advances on lines of credit and short-term debt	53,647	6,769
Repayments of line of credit and short-term debt	(3,498)	(1,461)
Taxes paid related to net share settlement	(5,405)	(1,595)
Proceeds from long-term debt	589,331	161,237
Repayments of long-term debt	(390,334)	(203,385)
Net proceeds from issuance of common stock	1,066	6,706
Repayment of and proceeds from finance lease obligation	(445)	(588)
Dividend distribution to noncontrolling interests	(108)	(1,180)
Other	(2,470)	542
Net cash and cash equivalents (used in) provided by financing activities	241,784	(32,955)
Effect of exchange rate changes on cash and cash equivalents	644	(35)
Change in cash and cash equivalents, including restricted cash	295,114	(5,019)
Cash and cash equivalents, beginning of period, including restricted cash	259,507	241,833
Cash and cash equivalents, end of period, including restricted cash	554,621	236,814
Supplemental Cash Flow Information
Interest paid during the period	1,746	4,107
Taxes paid during the period	21,743	23,199
Non-cash investing and financing activities:
Accounts payable balance related to the purchase of property, plant and equipment	7,569	14,234
Dividend payable to noncontrolling interest	$ 1,454	$ 1,400