Current and Long- Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Expenses
Commercial rebates, fees and returns	$ 89,466	$ 45,161
Professional, license, and other fees and expenses	34,962	27,070
Interest expense	16,683	18,411
Salaries, bonuses, and other compensation	14,823	12,838
Restructuring expense	74	2,883
Total accrued expenses	$ 156,008	$ 106,363