Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable	$ 61,936	$ 38,934
Accrued payroll and related costs	69,429	19,987
Accrued clinical trial expense	23,654	10,985
Accrued sales-related deductions and royalties	66,855	21,870
Other accrued expenses and liabilities	29,022	19,569
Accounts payable and accrued expenses	$ 250,896	$ 111,345