Current and Long- Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accrued Expenses
Commercial rebates, fees and returns	$ 52,561	$ 45,161
Professional, license, and other fees and expenses	31,564	27,070
Interest expense	5,832	18,411
Salaries, bonuses, and other compensation	9,845	12,838
Restructuring expense	2,093	2,883
Total accrued expenses	$ 101,895	$ 106,363