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Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt instruments, fair value	$ 189,889	$ 243,574
Debt instruments, carrying value	190,650	227,897
Convertible Notes
Debt instruments, fair value	26,526	22,925
Debt instruments, carrying value	16,545	16,545
Sensipar Notes
Debt instruments, fair value	86,933	123,655
Debt instruments, carrying value	92,343	126,799
Preotact-Secured Debt
Debt instruments, fair value	27,590	46,750
Debt instruments, carrying value	45,510	48,301
Regpara-Secured Debt
Debt instruments, fair value	48,840	50,244
Debt instruments, carrying value	$ 36,252	$ 36,252

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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