Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (243,561)	$ (96,460)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	98,178	100,722
Income tax, non-cash changes	7,489	(3,504)
Impairment of goodwill and indefinite-lived intangibles	193,641	102,238
Stock-based compensation	2,374	5,716
Amortization of debt issuance costs	4,020	4,843
Other non-cash items	5,776	(714)
Accounts receivable	28,052	26,737
Inventories	20,921	5,262
Other assets and liabilities	11,257	7,424
Accounts payable	24,523	7,479
Income taxes	(2,549)	3,099
NET CASH PROVIDED BY OPERATING ACTIVITIES	150,121	162,842
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(45,038)	(64,294)
Proceeds from sale of fixed assets	859
Other investing activities		9,631
NET CASH USED IN INVESTING ACTIVITIES	(44,179)	(54,663)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	11,690
Repayments of debt	(25,672)	(46,024)
Proceeds from borrowings on revolving credit facility	313,825	114,040
Repayments of borrowings on revolving credit facility	(316,910)	(114,040)
Cash dividends paid	(13,555)	(22,556)
Purchase of non-controlling redeemable shares	(5,020)	(6,681)
Payments related to tax withholdings for stock-based compensation	(458)	(108)
Finance lease payments	(960)	(1,230)
NET CASH USED IN FINANCING ACTIVITIES	(37,060)	(76,599)
Effect of exchange rate changes on cash	5,614	(1,117)
Net increase in cash and cash equivalents	74,496	30,463
Cash and cash equivalents at the beginning of the period	77,927	47,464
Cash and cash equivalents at the end of the period	$ 152,423	$ 77,927