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LEASES - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets    
Operating lease right-of-use assets $ 209,556 $ 203,834
Finance lease assets 41,346 41,647
Total leased assets 250,902 245,481
Current    
Operating 72,888 73,422
Finance 12,209 14,543
Noncurrent    
Operating 144,834 137,384
Finance 36,351 32,909
Total lease liabilities $ 266,282 $ 258,258