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Capitalized Interest (Tables)
 9 Months Ended
Sep. 30, 2018
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 the Company's capitalized interest during the three and nine months ended September 30, 2018 and 2017:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Interest capitalized, beginning of period
 
$
5,388

 
$
5,952

 
$
5,583

 
$
5,106

Interest incurred
 
6,517

 
6,615

 
19,737

 
19,754

Interest charged to interest expense
 
(6,197
)
 
(6,120
)
 
(18,808
)
 
(17,870
)
Interest charged to cost of sales
 
(1,136
)
 
(778
)
 
(1,940
)
 
(1,321
)
Interest capitalized, end of period
 
$
4,572

 
$
5,669

 
$
4,572

 
$
5,669