XML 69 R51.htm IDEA: XBRL DOCUMENT v3.20.4
Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]          
Cash $ 2,501,452 $ 1,265,502      
Cash equivalents 980,580 1,086,402      
Total cash and cash equivalents 3,482,032 2,351,904      
Restricted cash 4,352 6,388      
Total cash, cash equivalents and restricted cash $ 3,486,384 $ 2,358,292 $ 2,219,323 $ 2,219,323 $ 2,806,634