Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Expenses
Commercial rebates, fees and returns	$ 53,288	$ 44,807
Professional, license, and other fees and expenses	37,016	23,157
Salaries, bonuses, and other compensation	11,200	10,176
Restructuring expense	1,152	1,953
Total accrued expenses	$ 102,656	$ 80,093