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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 297,407 $ 267,109    
Restricted cash included in:        
Other current assets 46,507 26,096    
Other assets 16,587 18,095    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows 360,501 311,300 $ 387,515 $ 866,184
Debtors        
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents 120,121      
Restricted cash included in:        
Other current assets 16,119      
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 136,240 $ 102,468