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Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt instruments, fair value	$ 175,294	$ 184,752
Debt instruments, carrying value	169,569	175,847
Convertible Notes
Debt instruments, fair value	31,241	28,131
Debt instruments, carrying value	16,545	16,545
Sensipar Notes
Debt instruments, fair value	73,090	79,129
Debt instruments, carrying value	73,982	80,234
Preotact-Secured Debt
Debt instruments, fair value	29,324	28,605
Debt instruments, carrying value	42,790	42,816
Regpara-Secured Debt
Debt instruments, fair value	41,639	48,887
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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