Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Accumulated Deficit	Other Comprehensive (Loss)
BEGINNING BALANCES (In Shares) at Dec. 31, 2017		125,091,000
BEGINNING BALANCES at Dec. 31, 2017	$ 831,245	$ 550,472	$ 294,741	$ (13,968)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	(186,871)		(186,871)
Exercise of stock options (in Shares)		22,000
Exercise of stock options	546	$ 546
Compensation and share issuances related to restricted stock awards (in Shares)		288,000
Compensation and share issuances related to stock awards	9,206	$ 9,206
Stock-based compensation expense - stock options	7,993	$ 7,993
Foreign currency translation gain (loss)	(11,867)			(11,867)
Stock compensation plan withholdings for employee taxes (in Shares)		(55,000)
Stock compensation plan withholdings for employee taxes	(776)	$ (776)
Unrealized holding loss on available-for-sale securities	(9)			(9)
Akorn AG pension liability adjustment	12			12
Employee stock purchase plan expense (in Shares)		146,000
Employee stock purchase plan expense	2,809	$ 2,809
ENDING BALANCES (In Shares) at Sep. 30, 2018		125,492,000
ENDING BALANCES at Sep. 30, 2018	652,288	$ 570,250	107,870	(25,832)
BEGINNING BALANCES (In Shares) at Jun. 30, 2018		125,404,000
BEGINNING BALANCES at Jun. 30, 2018	721,835	$ 564,988	178,010	(21,163)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	(70,140)		(70,140)
Exercise of stock options	0
Compensation and share issuances related to restricted stock awards (in Shares)		118,000
Compensation and share issuances related to stock awards	3,389	$ 3,389
Stock-based compensation expense - stock options	2,357	$ 2,357
Foreign currency translation gain (loss)	(4,669)			(4,669)
Stock compensation plan withholdings for employee taxes (in Shares)		(30,000)
Stock compensation plan withholdings for employee taxes	(484)	$ (484)
Unrealized holding loss on available-for-sale securities	(4)			(4)
Akorn AG pension liability adjustment	4			4
Employee stock purchase plan expense	0
ENDING BALANCES (In Shares) at Sep. 30, 2018		125,492,000
ENDING BALANCES at Sep. 30, 2018	$ 652,288	$ 570,250	107,870	(25,832)
BEGINNING BALANCES (In Shares) at Dec. 31, 2018	125,492,373	125,492,000
BEGINNING BALANCES at Dec. 31, 2018	$ 443,866	$ 574,553	(107,168)	(23,519)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	$ (146,110)		(146,110)
Exercise of stock options (in Shares)	0
Exercise of stock options	$ 0
Compensation and share issuances related to restricted stock awards (in Shares)		751,000
Compensation and share issuances related to stock awards	10,923	$ 10,923
Stock-based compensation expense - stock options	4,274	$ 4,274
Foreign currency translation gain (loss)	(1,179)			(1,179)
Stock compensation plan withholdings for employee taxes (in Shares)		(97,000)
Stock compensation plan withholdings for employee taxes	(313)	$ (313)
Unrealized holding loss on available-for-sale securities	(3)			(3)
Akorn AG pension liability adjustment	113			113
Employee stock purchase plan expense	$ 837	$ 837
ENDING BALANCES (In Shares) at Sep. 30, 2019	126,145,832	126,146,000
ENDING BALANCES at Sep. 30, 2019	$ 312,408	$ 590,274	(253,278)	(24,588)
BEGINNING BALANCES (In Shares) at Jun. 30, 2019		126,108,000
BEGINNING BALANCES at Jun. 30, 2019	261,152	$ 584,592	(300,948)	(22,492)
Increase (Decrease) in Stockholders' Equity
Consolidated net income	47,670		47,670
Exercise of stock options	0
Compensation and share issuances related to restricted stock awards (in Shares)		47,000
Compensation and share issuances related to stock awards	3,934	$ 3,934
Stock-based compensation expense - stock options	1,453	$ 1,453
Foreign currency translation gain (loss)	(2,135)			(2,135)
Stock compensation plan withholdings for employee taxes (in Shares)		(9,000)
Stock compensation plan withholdings for employee taxes	(44)	$ (44)
Unrealized holding loss on available-for-sale securities	0
Akorn AG pension liability adjustment	39			39
Employee stock purchase plan expense	$ 339	$ 339
ENDING BALANCES (In Shares) at Sep. 30, 2019	126,145,832	126,146,000
ENDING BALANCES at Sep. 30, 2019	$ 312,408	$ 590,274	$ (253,278)	$ (24,588)