Geographic and Product Information (Major Customers) (Details) - Customers' concentration risk	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amerisource Bergen Corp. | Percent of Total Revenue
Major Customers
Percentage of concentration risk	8.10%	9.00%	10.70%
Amerisource Bergen Corp. | Percent of Net Accounts Receivable
Major Customers
Percentage of concentration risk	8.20%	9.70%
CVS | Percent of Total Revenue
Major Customers
Percentage of concentration risk	10.70%	9.80%	9.30%
CVS | Percent of Net Accounts Receivable
Major Customers
Percentage of concentration risk	8.20%	7.60%