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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Debtors' Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 406,493 $ 267,109    
Restricted cash included in other current assets 7,649 26,096    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows 430,334 311,300 $ 855,726 $ 761,865
Debtors        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents 178,924      
Restricted cash included in other current assets 3,428      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 182,352 $ 102,468