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Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Interest Incurred, Capitalized and Expensed
The following table represents interest incurred, interest capitalized, and interest expense for the six and three months ended June 30, 2013 and 2012: 
 
Six Months
 
Three Months
 
2013
 
2012
 
2013
 
2012
Interest incurred
$
4,650

 
$
4,683

 
$
2,326

 
$
2,334

Interest capitalized
(1,114
)
 
(330
)
 
(563
)
 
(218
)
Interest expense
$
3,536

 
$
4,353

 
$
1,763

 
$
2,116