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Noncontrolling Interests (Tables)
3 Months Ended
Mar. 31, 2012
Noncontrolling Interest [Abstract]  
Summary of redeemable noncontrolling interests
 
Income
Statement
Impact
 
Redeemable
Noncontrolling
Interests
Balance as of December 31, 2010
 
 
$
5,799

Noncontrolling interest
$
193

 
 
Redemption value change
402

 
595

Formation of noncontrolling interests
 
 

Distribution to noncontrolling interests
 
 
(176
)
Balance as of March 31, 2011
 
 
$
6,218

Balance as of December 31, 2011
 
 
$
6,964

Noncontrolling interest
$
210

 
 
Redemption value change
(34
)
 
176

Formation of noncontrolling interests
 
 

Distribution to noncontrolling interests
 
 
(190
)
Balance as of March 31, 2012
 
 
$
6,950