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Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt instruments, fair value	$ 110,291us-gaap_DebtInstrumentFairValue	$ 233,841us-gaap_DebtInstrumentFairValue
Debt instruments, carrying value	100,006us-gaap_LongTermDebt	148,932us-gaap_LongTermDebt
Convertible Notes
Debt instruments, fair value	0	92,338
Debt instruments, carrying value	0	16,545
Sensipar Notes
Debt instruments, fair value	26,312	54,097
Debt instruments, carrying value	26,230	54,395
rhPTH 1-84-Secured Debt
Debt instruments, fair value	54,730	50,058
Debt instruments, carrying value	42,790	42,790
Regpara-Secured Debt
Debt instruments, fair value	29,249	37,348
Debt instruments, carrying value	$ 30,986	$ 35,202

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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