Asset Sales (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended			24 Months Ended
	Mar. 29, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2011
Deferred Revenue Arrangement [Line Items]
Proceeds from divestiture of businesses							$ 6,500
Other revenue				$ 37,500	$ 49,796	$ 45,000
Proceeds from sale of diclofenac-misoprostol				$ 0	$ 1,750	$ 0
Intellectual Property
Deferred Revenue Arrangement [Line Items]
Proceeds from sale of diclofenac-misoprostol			$ 1,750
Royalty revenue, percentage of gross profits	25.00%
Royalty revenue term	5 years
Asset Sales Excluding Tech Transfers
Deferred Revenue Arrangement [Line Items]
Deferred revenue							5,500
Initiation of Tech Transfer
Deferred Revenue Arrangement [Line Items]
Proceeds from divestiture of businesses							500
Deferred revenue							250
Completion of Tech Transfer
Deferred Revenue Arrangement [Line Items]
Proceeds from divestiture of businesses							500
Deferred revenue							250
Asset Sales
Deferred Revenue Arrangement [Line Items]
Deferred revenue							$ 6,000
Other revenue		$ 6,000