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Sale of Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Sale of Assets [Abstract]  
Changes in Non-controlling Interest
The following table details the changes in non-controlling interest for the years ended December 31, 2012, 2011 and 2010 (in thousands):

 
2012
 
 
2011
 
 
2010
 
Non-controlling interest, beginning of period
 
$
381
 
 
$
454
 
 
$
328
 
Net income
 
 
2,060
 
 
 
2,049
 
 
 
1,197
 
Distributions
 
 
(1,973
)
 
 
(2,122
)
 
 
(1,071
)
Non-controlling interest, end of period
 
$
468
 
 
$
381
 
 
$
454