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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Cash and cash equivalents) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other investments [Abstract]        
Other deposits with maturity of more than three months $ 813,527 $ 212,271    
Other investments - Current 813,527 212,271    
Cash and cash equivalents [abstract]        
Cash and banks 129,500 115,575    
Restricted cash 54 69 $ 2,216  
Short-term bank deposits 259,020 199,877    
Other deposits with maturity of less than three months 149,308 204,444    
Cash and cash equivalents $ 537,882 [1] $ 519,965 [1] $ 250,541 [1] $ 337,779
[1] It includes restricted cash of $54, $69 and $2,216 as of December 31, 2020, 2019 and 2018, respectively. In addition, the Company had other investments with a maturity of more than three months for $813,527, $212,271 and $44,529 as of December 31, 2020, 2019 and 2018, respectively.