Basis of Presentation (Details 4)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue recognition
Percentage of Medicare Part D insurance coverage gap required to fund	50.00%
Customers
Consolidated total revenue (as a percent)	92.00%	97.00%	96.00%
Customer A
Customers
Consolidated total revenue (as a percent)	43.00%	27.00%	25.00%
Customer B
Customers
Consolidated total revenue (as a percent)	25.00%	24.00%	24.00%
Customer C
Customers
Consolidated total revenue (as a percent)	11.00%	20.00%	21.00%
Customer D
Customers
Consolidated total revenue (as a percent)	9.00%	17.00%	16.00%
Customer E
Customers
Consolidated total revenue (as a percent)	4.00%	9.00%	10.00%