Restricted Stock (Details1)	3 Months Ended		12 Months Ended
	Mar. 31, 2011 Common Class B-1 [Member]	Mar. 31, 2011 Common Class B-2 [Member]	Jun. 30, 2012 Common Class B-3 [Member]	Jun. 30, 2012 Common Class B-4 [Member]
Conversion of Stock [Line Items]
Conversion of Stock, Type of Stock Converted			B-3	B-4
Conversion of Class B shares to Class A shares, number of shares	5,642,302	5,547,733	5,661,591	5,374,768
Conversion date of Class B shares to Class A shares	2011-01-01	2012-01-01	2013-01-01	2014-01-01