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COMMITMENTS AND CONTINGENCIES
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
COMMITMENTS AND CONTINGENCIES
17. COMMITMENTS AND CONTINGENCIES
 
Capital commitments
 
As of December 31, 2018, commitments outstanding for the purchases of property, plant and equipment approximated
$
222.7
 million, which will be due subsequent to receipt of the purchases.
 
Lease commitments
 
The operating lease commitments as of December 31, 2018 were principally for the office rental from Daqo Group. The lease expense was $31,076, $37,756 and $38,633 for the years ended December 31, 2016, 2017 and 2018, respectively.
 
Future minimum lease payments are as follows:
 
 
 
 
Year ending December 31, 2019
 
$
11,279