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BASIS OF PRESENTATION - Debtors' Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 261,763 $ 267,109    
Other current assets 33,537 26,096    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows 311,852 311,300 $ 283,498 $ 866,184
Debtors        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents 57,370      
Other current assets 3,203      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 60,573 $ 102,468