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REVENUES - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Contract Assets          
Beginning balance, net of allowance $ 1,104,255 $ 1,106,289 $ 1,196,101 $ 1,067,980  
Additions (collections), net 19,628 6,487 (58,027) 55,186  
Bad debt, net of recoveries (2,720) (6,189) (16,911) (16,579)  
Ending balance, net of allowance 1,121,163 1,106,587 1,121,163 1,106,587  
Accounts receivable from leases, net of allowance 345,761 326,432 345,761 326,432  
Total accounts receivable, net of allowance 1,466,924 1,433,019 1,466,924 1,433,019 $ 1,508,370
Contract Liabilities          
Beginning balance 204,013 206,807 181,748 191,916  
Revenue recognized, included in beginning balance (106,893) (97,775) (131,449) (141,045)  
Additions, net of revenue recognized during period 96,173 88,297 142,994 146,458  
Ending balance 193,293 197,329 193,293 197,329  
Deferred revenue from leases 50,930 54,639 50,930 54,639  
Total deferred revenue 244,223 251,968 244,223 251,968  
Less: Non-current portion, included in other long-term liabilities 30,484 41,473 30,484 41,473  
Current portion of deferred revenue, included in deferred income $ 213,739 $ 210,495 $ 213,739 $ 210,495