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Fair Value Measurements (Details 2) (USD $)
0 Months Ended 9 Months Ended
Jun. 01, 2012
Sep. 30, 2013
Sep. 30, 2012
Assets and liabilities measured at fair value on a recurring basis      
Marketable equity securities, adjusted cost basis   $ 300,000  
Reconciliation of changes in the fair values of level 3 liabilities      
Fair value of debt based on average trading price   387,300,000  
Revenue earnouts
     
Reconciliation of changes in the fair values of level 3 liabilities      
Balance at beginning of period   2,857,000 1,673,000
Additions     1,855,000
Payments   (1,201,000)  
Change in fair value recognized in earnings   (801,000) (439,000)
Balance at end of period   855,000 3,089,000
Springbox revenue sharing
     
Assets and liabilities measured at fair value on a recurring basis      
Period after the date of sale entity entitled to receive a percentage of revenue collected 3 years    
Changes in fair value of Level 3 assets      
Balance at beginning of period   768,000  
Additions     768,000
Collections   (200,000)  
Change in fair value recognized in earnings   (56,000)  
Balance at end of period   $ 512,000 $ 768,000