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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]      
Accretion of interest on bond $ 13,500 $ 11,800 $ 5,700
Cash and cash equivalents 217,835 214,862 224,190
Restricted cash and short-term deposits (current portion) 332,033 222,265 183,693
Restricted cash (non-current portion) 154,393 175,550 232,335
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 704,261 $ 612,677 $ 640,218