Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Derivative Asset, Fair Value	$ 135
Total assets	14,656	29,007
Liabilities:
Total liabilities	63,558	154,397
Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value	40,338	145,098
Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value	21,630
Put and call options [Member]
Assets:
Derivative Asset, Fair Value		943
Liabilities:
Derivative Liability, Fair Value	1,590	9,299
Short-term Deposit [Member]
Assets:
Short-term Deposits		999
Marketable securities [Member]
Assets:
Restricted certificates of deposits	14,521	27,065
Fair Value, Inputs, Level 1 [Member]
Assets:
Derivative Asset, Fair Value	0
Total assets	14,521	28,064
Liabilities:
Total liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value	0
Fair Value, Inputs, Level 1 [Member] | Put and call options [Member]
Assets:
Derivative Asset, Fair Value		0
Liabilities:
Derivative Liability, Fair Value	0	0
Fair Value, Inputs, Level 1 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits		999
Fair Value, Inputs, Level 1 [Member] | Marketable securities [Member]
Assets:
Restricted certificates of deposits	14,521	27,065
Fair Value, Inputs, Level 2 [Member]
Assets:
Derivative Asset, Fair Value	135
Total assets	135	943
Liabilities:
Total liabilities	1,590	154,397
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value	0	145,098
Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value	0
Fair Value, Inputs, Level 2 [Member] | Put and call options [Member]
Assets:
Derivative Asset, Fair Value		943
Liabilities:
Derivative Liability, Fair Value	1,590	9,299
Fair Value, Inputs, Level 2 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits		0
Fair Value, Inputs, Level 2 [Member] | Marketable securities [Member]
Assets:
Restricted certificates of deposits	0	0
Fair Value, Inputs, Level 3 [Member]
Assets:
Derivative Asset, Fair Value	0
Total assets	0	0
Liabilities:
Total liabilities	61,968	0
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative Liability, Fair Value	40,338	0
Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative Liability, Fair Value	21,630
Fair Value, Inputs, Level 3 [Member] | Put and call options [Member]
Assets:
Derivative Asset, Fair Value		0
Liabilities:
Derivative Liability, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] | Short-term Deposit [Member]
Assets:
Short-term Deposits		0
Fair Value, Inputs, Level 3 [Member] | Marketable securities [Member]
Assets:
Restricted certificates of deposits	$ 0	$ 0