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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Total cash, cash equivalents and restricted cash $ 83,311 $ 106,615 $ 88,538 $ 55,921
Cash paid for interest $ 38,904 $ 57,981 $ 39,732