Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt instruments, fair value	$ 223,594	$ 184,752
Debt instruments, carrying value	155,602	175,847
Convertible Notes
Debt instruments, fair value	96,718	28,131
Debt instruments, carrying value	16,545	16,545
Sensipar Notes
Debt instruments, fair value	60,588	79,129
Debt instruments, carrying value	61,065	80,234
PTH 1-84-(Europe, CIS and Turkey)-Secured Debt
Debt instruments, fair value	27,597	28,605
Debt instruments, carrying value	42,790	42,816
Regpara-Secured Debt
Debt instruments, fair value	38,661	48,887
Debt instruments, carrying value	$ 35,202	$ 36,252