Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Debt instruments, fair value	$ 130,341		$ 233,841
Debt instruments, carrying value	116,747		148,932
Convertible Notes
Debt instruments, fair value	0	[1]	92,338	[1]
Debt instruments, carrying value	0	[1]	16,545	[1]
Sensipar Notes
Debt instruments, fair value	40,550		54,097
Debt instruments, carrying value	40,616		54,395
rhPTH 1-84-Secured Debt
Debt instruments, fair value	53,415		50,058
Debt instruments, carrying value	42,790		42,790
Regpara-Secured Debt
Debt instruments, fair value	36,376		37,348
Debt instruments, carrying value	$ 33,341		$ 35,202

[1] See Note 6