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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Cash and cash equivalents) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other investments [Abstract]        
Other deposits with maturity of more than three months $ 132,736 $ 144,853    
Other investments - Current 132,736 144,853    
Cash and cash equivalents [abstract]        
Cash and banks 100,739 70,711    
Restricted cash 50 83 $ 88  
Short-term bank deposits 229,239 70,760    
Other deposits with maturity of less than three months 7,751 41,909    
Cash and cash equivalents $ 337,779 [1] $ 183,463 [1] $ 151,491 [1] $ 213,303
[1] It includes restricted cash of USD 50, USD 83 and USD 88 as of December 31, 2017, 2016 and 2015, respectively. In addition, the Company had other investments with a maturity of more than three months for USD 135,864, USD 150,851 and USD 237,191 as of December 31, 2017, 2016 and 2015, respectively.