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Capitalized Interest (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Interest capitalized, beginning of period
 
$
5,583

 
$
5,106

Interest incurred
 
6,595

 
6,559

Interest charged to interest expense
 
(6,282
)
 
(5,836
)
Interest charged to cost of sales
 
(351
)
 
(265
)
Interest capitalized, end of period
 
$
5,545

 
$
5,564