Current and Long-Term Liabilities - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accrued Expenses
Commercial rebates, fees and returns	$ 52,860	$ 45,161
Professional, license, and other fees and expenses	24,600	27,070
Interest expense	16,926	18,411
Salaries, bonuses, and other compensation	12,106	12,838
Restructuring expense	1,107	2,883
Total accrued expenses	$ 107,599	$ 106,363