Acquisitions and Divestitures - Purchase Price Allocation for Acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 07, 2018	May 04, 2018
Business Acquisition [Line Items]
Goodwill	$ 522,814		$ 419,504	$ 426,226
AvKARE and R&S Acquisitions
Business Acquisition [Line Items]
Trade accounts receivable, net		$ 46,702
Inventories		71,908
Prepaid expenses and other current assets		11,316
Related party receivables		61
Property, plant and equipment		5,278
Goodwill	$ 104,000	103,679
Intangible assets, net		130,800
Operating lease right-of-use assets - related party		5,544
Total assets acquired		375,288
Accounts payable and accrued expenses		62,489
Related party payables		1,532
Operating lease liabilities - related party		5,544
Redeemable non-controlling interests		11,475
Fair value of consideration transferred		294,248
Total liabilities assumed		$ 69,565
Impax Acquisition
Business Acquisition [Line Items]
Trade accounts receivable, net						$ 210,820
Inventories						183,088
Prepaid expenses and other current assets						91,430
Property, plant and equipment						87,472
Goodwill						398,733
Intangible assets, net						1,574,929
Other						55,790
Total assets acquired						2,602,262
Accounts payable						47,912
Accrued expenses and other current liabilities						274,979
Long-term debt						599,400
Other long-term liabilities						33,793
Total liabilities assumed						956,084
Net assets acquired						$ 1,646,178
Gemini Laboratories, LLC Acquisition
Business Acquisition [Line Items]
Trade accounts receivable, net			8,158
Inventories			1,851
Prepaid expenses and other current assets			3,795
Property, plant and equipment			11
Goodwill			1,500
Intangible assets, net			142,740
Other			324
Total assets acquired			158,379
Accounts payable			1,764
Accrued expenses and other current liabilities			14,644
Redeemable non-controlling interests					$ 3,000
License liability			20,000
Total liabilities assumed			36,408
Net assets acquired			$ 121,971