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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 311,162 $ 267,109    
Restricted cash included in:        
Other current assets 7,653 26,096    
Other assets 19,282 18,095    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 338,097 $ 311,300 $ 322,197 $ 855,726