Voluntary Reorganization Under Chapter 11 - Debtors-In-Possession Balance Sheet (Details) - USD ($)	Jun. 30, 2020	May 22, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 83,130,000			$ 144,804,000	$ 178,264,000
Trade accounts receivable, net	131,332,000			134,173,000
Inventories, net	185,181,000			170,047,000
Income taxes receivable	50,204,000			1,211,000
Prepaid expenses and other current assets	31,693,000			29,812,000
TOTAL CURRENT ASSETS	481,540,000			480,047,000
Property, plant and equipment, net	281,682,000			295,533,000
OTHER LONG-TERM ASSETS
Intangible assets, net	203,107,000			215,801,000
Right-of-use assets, net - Operating leases	21,404,000			22,445,000
Other non-current assets	14,031,000			6,890,000
TOTAL OTHER LONG-TERM ASSETS	238,542,000			513,059,000
TOTAL ASSETS	1,001,764,000			1,288,639,000
CURRENT LIABILITIES
Trade accounts payable	31,786,000			44,958,000
Accrued royalties	1,968,000			5,956,000
Accrued compensation	20,438,000			13,005,000
Current portion of long-term debt (net of deferred financing costs)	855,246,000			843,328,000
Debtor-in-possession financing	30,000,000	$ 30,000,000.0		0
Accrued administrative fees	23,612,000			31,725,000
Current portion of accrued legal fees and contingencies	4,364,000			23,673,000
Accrued expenses and other liabilities	22,466,000			20,652,000
TOTAL CURRENT LIABILITIES	990,012,000			985,587,000
LIABILITIES SUBJECT TO COMPROMISE	76,516,000			0
LONG-TERM LIABILITIES
Uncertain tax liabilities	2,741,000			2,633,000
TOTAL LONG-TERM LIABILITIES	13,935,000			68,760,000
TOTAL LIABILITIES	1,080,463,000			1,054,347,000
TOTAL SHAREHOLDERS’ (DEFICIT) EQUITY	(78,699,000)		$ (19,494,000)	234,292,000	$ 261,152,000	$ 365,749,000	$ 443,866,000
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	1,001,764,000			$ 1,288,639,000
Debtor-In-Possession
CURRENT ASSETS
Cash and cash equivalents	78,631,000
Trade accounts receivable, net	130,921,000
Inventories, net	172,246,000
Income taxes receivable	50,204,000
Prepaid expenses and other current assets	30,676,000
TOTAL CURRENT ASSETS	462,678,000
Property, plant and equipment, net	217,261,000
OTHER LONG-TERM ASSETS
Intangible assets, net	203,107,000
Right-of-use assets, net - Operating leases	21,003,000
Long-term investments	73,913,000
Other non-current assets	10,440,000
TOTAL OTHER LONG-TERM ASSETS	308,463,000
TOTAL ASSETS	988,402,000
CURRENT LIABILITIES
Trade accounts payable	30,956,000
Accrued royalties	1,968,000
Accrued compensation	16,998,000
Current portion of long-term debt (net of deferred financing costs)	855,246,000
Debtor-in-possession financing	30,000,000
Accrued administrative fees	23,612,000
Current portion of accrued legal fees and contingencies	4,364,000
Accrued expenses and other liabilities	21,566,000
TOTAL CURRENT LIABILITIES	984,710,000
LIABILITIES SUBJECT TO COMPROMISE	76,516,000
LONG-TERM LIABILITIES
Uncertain tax liabilities	2,741,000
TOTAL LONG-TERM LIABILITIES	2,741,000
TOTAL LIABILITIES	1,063,967,000
TOTAL SHAREHOLDERS’ (DEFICIT) EQUITY	(75,565,000)
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 988,402,000