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BASIS OF PRESENTATION - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 448,130 $ 406,493    
Restricted cash included in:        
Other current assets 7,493 7,649    
Other assets 13,965 16,192    
Total cash, cash equivalents and restricted cash in the Statement of Cash Flows $ 469,588 $ 430,334 $ 360,501 $ 311,300