LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Operating lease right-of-use assets	$ 201,717	$ 203,834
Finance lease assets	37,060	41,647
Total leased assets	238,777	245,481
Current
Operating	71,687	73,422
Finance	11,070	14,543
Noncurrent
Operating	137,647	137,384
Finance	33,283	32,909
Total lease liabilities	$ 253,687	$ 258,258