Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
(Loss) income from operations used for basic earnings per share	$ (401,909,000)	$ (24,550,000)	$ 184,243,000
Depreciation and amortization	82,805,000	85,173,000	87,963,000
Impairment of intangible assets	231,086,000	128,127,000	44,369,000
Fixed asset impairment	6,135,000	0	0
Amortization of deferred financing fees	5,216,000	5,216,000	10,760,000
Non-cash stock compensation expense	21,503,000	21,018,000	15,412,000
Non-cash interest expense	0	0	777,000
Income from available-for-sale securities	0	(3,032,000)	0
Deferred income taxes, net	(37,396,000)	(115,249,000)	(32,934,000)
Gain on sale of available-for-sale security	0	199,000	45,000
Other	421,000	(307,000)	(4,888,000)
Changes in operating assets and liabilities:
Trade accounts receivable, net	(11,627,000)	141,979,000	(132,617,000)
Inventories, net	9,694,000	(8,367,000)	10,208,000
Prepaid expenses and other current assets	3,847,000	(12,232,000)	(7,262,000)
Other non-current assets	(3,120,000)	(3,519,000)	(301,000)
Trade accounts payable	(5,002,000)	(9,223,000)	6,139,000
Accrued legal fees and contingencies	24,120,000	21,492,000	711,000
FIN 48 Reserve	9,690,000	38,999,000	(984,000)
Accrued expenses and other liabilities	(4,357,000)	(18,091,000)	(14,951,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(68,894,000)	247,633,000	166,690,000
INVESTING ACTIVITIES:
Proceeds from disposal of assets	30,000	4,815,000	5,966,000
Payments for other intangible assets	(50,000)	(200,000)	(3,950,000)
Purchases of property, plant and equipment	(69,111,000)	(95,170,000)	(74,938,000)
NET CASH USED IN INVESTING ACTIVITIES	(69,131,000)	(90,555,000)	(72,922,000)
FINANCING ACTIVITIES:
Proceeds under stock option and stock purchase plans	546,000	9,320,000	11,291,000
Stock compensation plan withholdings from employee taxes	(777,000)	(1,726,000)	(1,496,000)
Payments of contingent acquisition liabilities	(4,793,000)	0	0
Debt financing costs	0	0	(5,128,000)
Common stock repurchases	0	0	(45,000,000)
Lease Payments	(14,000)	0	0
Debt repayment	0	0	(200,000,000)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(5,038,000)	7,594,000	(240,333,000)
Effect of changes in exchange rates on cash and cash equivalents	(1,032,000)	1,183,000	2,000
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(144,095,000)	165,855,000	(146,563,000)
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR	369,889,000	204,034,000	350,597,000
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF YEAR	$ 225,794,000	$ 369,889,000	$ 204,034,000