3. Fair Value Measurement (Debt Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt instruments, fair value	$ 182,324	$ 182,779
Debt instruments, carrying value	281,659	290,057
4.25% Convertible Notes
Debt instruments, fair value	41,408	32,595
Debt instruments, carrying value	106,377	104,071
Derivative Liability
Debt instruments, fair value	314	230
Debt instruments, carrying value	314	230
Contingent Consideration
Debt instruments, fair value	1,863	2,403
Debt instruments, carrying value	1,863	2,403
Treximet Secured Notes
Debt instruments, fair value	138,739	147,551
Debt instruments, carrying value	$ 173,105	$ 183,353