A summary of our preferred stock activity for the years ended December 31, 2013, 2012 and 2011, is as follows (in thousands):


	Preferred Stock
	Class A			Class B			Junior			Total
Balance at January 1, 2011	$	80,278		$	231,559		$	141,548		$	453,385
January 28, 2011 funding		38,095			—			—			38,095
June 30, 2011 funding		24,478			—			—			24,478
Allocation of embedded derivative upon issuance of preferred stock		(6,018	)		—			—			(6,018	)
Preferred stock return		13,943			17,388			—			31,331
Accretion of preferred stock		1,913			1,625			6,643			10,181

Balance at December 31, 2011		152,689			250,572			148,191			551,452
Preferred stock return		19,505			32,922			—			52,427
Accretion of preferred stock		2,005			1,541			6,953			10,499

Balance at December 31, 2012		174,199			285,035			155,144			614,378
Preferred stock return		11,219			18,058			—			29,277
Accretion of preferred stock		1,005			763			3,517			5,285
Conversion to common stock upon the IPO		(186,423	)		(303,856	)		(158,661	)		(648,940	)

Balance at December 31, 2013	$	—		$	—		$	—		$	—