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Noncontrolling interests
6 Months Ended
Jun. 30, 2011
Noncontrolling Interests [Abstract]  
Non controlling interests
11. Noncontrolling Interests
     We own some of our animal hospitals in partnerships with noncontrolling interest holders. We consolidate our partnerships in our consolidated financial statements because our ownership interest in these partnerships is equal to or greater than 50.1% and we control these entities. We record noncontrolling interest in income of subsidiaries equal to our partners’ percentage ownership of the partnerships’ income. We also record changes in the redemption value of our mandatorily redeemable and redeemable noncontrolling interests in net income attributable to noncontrolling interests in our condensed, consolidated income statements. We reflect our noncontrolling partners’ cumulative share in the equity of the respective partnerships as either noncontrolling interests in equity, mandatorily redeemable noncontrolling interests in other liabilities or redeemable noncontrolling interests in temporary equity (mezzanine).
a. Mandatorily Redeemable Noncontrolling Interests
     The terms of some of our partnership agreements require us to purchase the partner’s equity in the partnership in the event of the partner’s death. We report these redeemable noncontrolling interests at their estimated redemption value and classify them as liabilities due to the certainty of the related event. We recognize changes in the obligation in net income attributable to noncontrolling interests. At June 30, 2011 and December 31, 2010, these liabilities were $3.1 million and $1.7 million, respectively, and are included in other liabilities in our consolidated balance sheets.
b. Redeemable Noncontrolling Interests
     We also enter into partnership agreements whereby the minority partner is issued certain “put” rights. These rights are normally exercisable at the sole discretion of the minority partner. We report these redeemable noncontrolling interests at their estimated redemption value and classify them in temporary equity (mezzanine). We recognize changes in the obligation in net income attributable to noncontrolling interests. At June 30, 2011 and December 31, 2010, balances in temporary equity related to these types of arrangements were $6.3 million and $5.8 million, respectively.
     The following table provides a summary of redeemable noncontrolling interests (in thousands):
                 
    Income     Redeemable  
    Statement     Noncontrolling  
    Impact     Interests  
Balance as of December 31, 2009
          $ 4,369  
 
               
Noncontrolling interest
  $ 382          
Redemption value change
          382  
 
             
Formation of noncontrolling interests
            450  
Distribution to noncontrolling interests
            (286 )
 
             
Balance as of June 30, 2010
          $ 4,915  
 
             
 
               
Balance as of December 31, 2010
          $ 5,799  
 
               
Noncontrolling interest
  $ 428          
Redemption value change
    402       830  
 
             
Distribution to noncontrolling interests
            (372 )
 
             
Balance as of June 30, 2011
          $ 6,257