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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 261,763 $ 267,109    
Restricted cash included in:        
Other current assets 33,537 26,096    
Other assets 16,552 18,095    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 311,852 $ 311,300 $ 283,498 $ 866,184