3. Fair Value Measurement (Debt Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt instruments, fair value	$ 217,120	$ 271,375
Debt instruments, carrying value	301,020	325,046
4.25% Convertible Notes
Debt instruments, fair value	48,889	68,637
Debt instruments, carrying value	100,818	99,776
Derivative Liability
Debt instruments, fair value	2,371	9,165
Debt instruments, carrying value	2,371	9,165
Contingent Consideration
Debt instruments, fair value	8,553	14,055
Debt instruments, carrying value	8,553	14,055
Treximet Secured Notes
Debt instruments, fair value	157,307	179,518
Debt instruments, carrying value	$ 189,278	$ 202,050