Fair Value Measurement (Debt Instruments) (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt instruments, fair value	$ 233,841	$ 184,752
Debt instruments, carrying value	148,932	175,847
Convertible Notes
Debt instruments, fair value	92,338	28,131
Debt instruments, carrying value	16,545	16,545
Sensipar Notes
Debt instruments, fair value	54,097	79,129
Debt instruments, carrying value	54,395	80,234
PTH 1-84-(Europe, CIS and Turkey)-Secured Debt
Debt instruments, fair value	50,058	28,605
Debt instruments, carrying value	42,790	42,816
Regpara-Secured Debt
Debt instruments, fair value	37,348	48,887
Debt instruments, carrying value	$ 35,202	$ 36,252