Commitments, Contingencies and Guarantees (Details) (USD $)	6 Months Ended	9 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Commitments, Contingencies and Guarantees (Textual) [Abstract]
Maximum amount of civil penalties per violation under the federal False Claims Act		$ 11,000
Maximum amount of civil penalties per violation under the state False Claims Act		12,000
Alleged amount of outlier payments received		30,000,000
Settlement charges recorded during period	1,200,000
Guarantees in the form of letters of credit		3,900,000	4,000,000
Additional purchase consideration			32,200,000
Obligation		$ 0