Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Debt instruments, fair value	$ 119,235		$ 233,841
Debt instruments, carrying value	107,277		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	33,525		54,097
Debt instruments, carrying value	33,501		54,395
rhPTH 1-84-Secured Debt
Debt instruments, fair value	54,838		50,058
Debt instruments, carrying value	42,790		42,790
Regpara-Secured Debt
Debt instruments, fair value	30,872		37,348
Debt instruments, carrying value	$ 30,986		$ 35,202

[1] See Note 6