Quarterly report pursuant to Section 13 or 15(d)

Share Repurchases (Details Textual)

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Share Repurchases (Details Textual) (USD $)
3 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
February 2010 authorization [Member]
Jun. 30, 2012
August 2011 authorization [Member]
Jun. 30, 2012
Outside of Publically Announced Repurchase Program [Member]
Jun. 30, 2011
Outside of Publically Announced Repurchase Program [Member]
May 31, 2011
Class A Common Stock [Member]
Feb. 28, 2010
Class A Common Stock [Member]
February 2010 authorization [Member]
Aug. 31, 2011
Class A Common Stock [Member]
August 2011 authorization [Member]
May 31, 2011
Class B Common Stock [Member]
Share Repurchases (Textual) [Abstract]                    
Stock Repurchase Program               $ 10,000,000 $ 20,000,000  
Payment for repurchase of class A common stock 5,115,000 6,327,000         3,400,000      
Treasury stock repurchased under publically announced repurchase programs     1,696,774 2,100,000     1,000,000     618,664
Treasury stock acquired volume weighted average price     $ 3.49 $ 2.25 $ 2.36 $ 3.52 $ 3.43      
Stock repurchase program remaining authorization       $ 7,700,000            
Treasury stock repurchased outside of publically announced repurchase program for tax withholding         124,404 113,734        
Share Repurchases (Additional Textual) [Abstract]                    
Number of daily trading session represented volume weighted average price description   The Company paid a total of $3.4 million or approximately $3.43 per share, which represented the volume weighted-average price of the Company's Class A Common Stock for the three daily trading sessions on May 23, 24 and 25, 2011, as reported on the NASDAQ Global Select Market.