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Capitalized Interest (Tables)
 6 Months Ended
Jun. 30, 2019
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract]  
Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales
The following table reflects the changes in our capitalized interest during the three and six months ended June 30, 2019 and 2018:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Interest capitalized, beginning of period
 
$
4,140

 
$
5,545

 
$
4,154

 
$
5,583

Interest incurred
 
6,607

 
6,624

 
13,106

 
13,220

Interest charged to interest expense
 
(6,301
)
 
(6,329
)
 
(12,516
)
 
(12,611
)
Interest charged to cost of sales
 
(592
)
 
(452
)
 
(890
)
 
(804
)
Interest capitalized, end of period
 
$
3,854

 
$
5,388

 
$
3,854

 
$
5,388