3. Fair Value Measurement (Debt Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt instruments, fair value	$ 176,380	$ 182,779
Debt instruments, carrying value	281,227	290,057
4.25% Convertible Notes
Debt instruments, fair value	35,555	32,595
Debt instruments, carrying value	105,217	104,071
Derivative Liability
Debt instruments, fair value	584	230
Debt instruments, carrying value	584	230
Contingent Consideration
Debt instruments, fair value	2,749	2,403
Debt instruments, carrying value	2,749	2,403
Treximet Secured Notes
Debt instruments, fair value	137,492	147,551
Debt instruments, carrying value	$ 172,677	$ 183,353