v3.10.0.1
REVENUE - Contract Balances - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Contract With Customer Asset And Liability [Abstract]    
Accounts Receivable Net Current $ 318,075 $ 341,989
ContractWithCustomerAssetNetCurrent 0 0
Deferred Revenue, Current 21,125 17,519
Deferred Revenue, Noncurrent 5,455 13,000
Contract Assets [Member]    
Contract Assets or Liabilities Line Items [Line Items}    
Beginning Balance   0
Satisfaction of Liability 0  
Additional amounts recognized 0  
Ending Balance 0  
Contract Liabilities [Member]    
Contract Assets or Liabilities Line Items [Line Items}    
Beginning Balance   $ 30,519
Satisfaction of Liability (10,670)  
Additional amounts recognized 6,731  
Ending Balance $ 26,580