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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Cash and cash equivalents) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other investments [Abstract]        
Other deposits with maturity of more than three months $ 44,529 $ 132,736    
Other investments - Current 44,529 132,736    
Cash and cash equivalents [abstract]        
Cash and banks 87,863 100,739    
Restricted cash 2,216 50 $ 83  
Short-term bank deposits 140,456 229,239    
Other deposits with maturity of less than three months 20,006 7,751    
Cash and cash equivalents $ 250,541 [1] $ 337,779 [1] $ 183,463 [1] $ 151,491
[1] It includes restricted cash of $2,216, $50 and $83 as of December 31, 2018, 2017 and 2016, respectively. In addition, the Company had other investments with a maturity of more than three months for $51,472, $135,864 and $150,851 as of December 31, 2018, 2017 and 2016, respectively.