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Noncontrolling Interests (Tables)
6 Months Ended
Jun. 30, 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
$
428

 
 
Redemption value change
402

 
830

Distribution to noncontrolling interests
 
 
(372
)
Balance as of June 30, 2011
 
 
$
6,257

 
 
 
 
Balance as of December 31, 2011
 
 
$
6,964

Noncontrolling interest
$
446

 
 
Redemption value change
17

 
463

Distribution to noncontrolling interests
 
 
(442
)
Balance as of June 30, 2012
 
 
$
6,985