Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES:
Consolidated net (loss) income	$ (186,871)	$ 40,667
Adjustments to reconcile consolidated net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	61,101	63,792
Amortization of debt financing costs	3,912	3,912
Impairment of intangible assets	112,998	15,678
Non-cash stock compensation expense	17,199	15,626
Income from available-for-sale securities	0	(3,032)
Deferred income taxes, net	(42,726)	(3,407)
Loss on sale of available-for-sale securities	0	199
Other	467	253
Changes in operating assets and liabilities:
Trade accounts receivable	(22,269)	94,520
Inventories, net	(11,422)	(7,286)
Prepaid expenses and other current assets	(2,016)	(22,469)
Trade accounts payable	10,752	(1,782)
Accrued expenses and other liabilities	22,135	11,780
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(36,740)	208,451
INVESTING ACTIVITIES:
Proceeds from disposal of assets	28	4,811
Payments for intangible assets	(50)	(200)
Purchases of property, plant and equipment	(51,045)	(77,538)
NET CASH USED IN INVESTING ACTIVITIES	(51,067)	(72,927)
FINANCING ACTIVITIES:
Proceeds from the exercise of stock options	546	9,314
Stock compensation plan withholdings for employee taxes	(776)	(2,079)
Payment of contingent acquisition liabilities	(4,793)	0
Lease payments	(10)	0
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(5,033)	7,235
Effect of exchange rate changes on cash and cash equivalents	(900)	598
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(93,740)	143,357
Cash and cash equivalents, and restricted at beginning of period	369,889	204,034
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	276,149	347,391
SUPPLEMENTAL DISCLOSURES:
Amount paid for interest	40,487	33,691
Amount paid for income taxes, net	9,667	44,155
Additional capital expenditures included in accounts payable	$ 10,504	$ 9,734