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Notes Payable (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Interest Incurred, Capitalized and Expensed
The following table represents interest incurred, interest capitalized, and interest expense for the nine and three months ended September 30, 2013 and 2012: 
 
Nine Months
 
Three Months
 
2013
 
2012
 
2013
 
2012
Interest incurred
$
6,974

 
$
6,912

 
$
2,324

 
$
2,229

Interest capitalized
(4,459
)
 
(656
)
 
(3,344
)
 
(326
)
Interest expense
$
2,515

 
$
6,256

 
$
(1,020
)
 
$
1,903