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LEASES - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Assets:    
Operating lease right-of-use assets $ 225,300 $ 235,979
Liabilities:    
Operating lease liabilities (current) 36,394 37,339
Operating lease liabilities (noncurrent) 230,260 236,697
Total operating lease liabilities $ 266,654 $ 274,036
Proportion of operating lease right-of-use assets located in the United States (as a percent) 90.00%