Commitments and Contingencies (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Total recorded provisions for Michigan, Massachusetts and a separate unrelated matter											$ 24,200,000
Cumulative Payments of Relator's expenses and attorneys' fees for Michigan and Massachusetts Settlement											385,000
Increased Costs as a result of Repack Matters										(10,500,000)	(1,200,000)
Litigation And Other Professional Fees	11,148,000	4,931,000	26,093,000	7,203,000	23,103,000	6,742,000	19,816,000	6,013,000	49,375,000	55,674,000	113,709,000
Michigan settlement agreement [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements											11,600,000
Massachusetts settlement agreement [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements											9,450,000
DEA Settlement [Member]
Loss Contingencies [Line Items]
Payments for Legal Settlements									$ 50,000,000