Organization and Business Activities (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net product sales	$ 103,711	$ 94,639	$ 210,860	$ 230,439
Cost of sales (excluding amortization of product rights)	28,158	28,089	58,017	60,167
Income tax expense (benefit)	(833)	(2,928)	(42,291)	15,142
Net income (loss)	598	(5,830)	(63,398)	14,161
Basic net income (loss) per share (in dollars per share)	$ 0.01	$ (0.08)	$ (0.97)	$ 0.20
Diluted net income (loss) per share (in dollars per share)	$ 0.01	$ (0.08)	$ (0.97)	$ 0.19
As Reported
Net product sales		94,639		230,439
Cost of sales (excluding amortization of product rights)		24,721		56,799
Income tax expense (benefit)		(1,187)		16,883
Net income (loss)		(4,203)		15,788
Basic net income (loss) per share (in dollars per share)		$ (0.06)		$ 0.23
Diluted net income (loss) per share (in dollars per share)		$ (0.06)		$ 0.22
Misstatement in cost of sales | Adjustment
Cost of sales (excluding amortization of product rights)		3,368		3,368
Income tax expense (benefit)		(1,741)		(1,741)
Net income (loss)		$ (1,627)		$ (1,627)
Basic net income (loss) per share (in dollars per share)		$ (0.02)		$ (0.02)
Diluted net income (loss) per share (in dollars per share)		$ (0.02)		$ (0.02)