Income Taxes (Summary Of Components Of Deferred Income Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Taxes [Abstract]
Net operating loss carryforwards	$ 17,893	$ 13,421
Capitalized research and development costs	6,503	6,419
Orphan drug credit carryforward		1,482
Research and development credit carryforward		3,449
Non-deductible reserves	6,118	5,385
Depreciation	273	670
Intangible asset amortization	11,179	6,965
Equity compensation	10,783	9,770
Other	1,267	1,316
Subtotal	54,016	48,877
Valuation allowance	(4,876)	(6,238)	(5,949)	(6,436)
Deferred tax assets	49,140	42,639
Intangible asset amortization	198,334	192,963
Convertible note	6,335	6,584
Prepaid expenses	1,388	1,207
Deferred tax liabilities	206,057	200,754
Net deferred tax liability	$ (156,917)	$ (158,115)