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REVENUES - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Contract Assets          
Beginning balance, net of allowance $ 1,041,173 $ 955,504 $ 1,200,050 $ 1,071,418  
Additions (collections), net 73,497 160,063 (77,920) 49,687  
Bad debt, net of recoveries (6,752) (4,923) (14,212) (10,461)  
Ending balance, net of allowance 1,107,918 1,110,644 1,107,918 1,110,644  
Accounts receivable from leases, net of allowance 311,121 312,936 311,121 312,936  
Total accounts receivable, net of allowance 1,419,039 1,423,580 1,419,039 1,423,580 $ 1,508,370
Contract Liabilities          
Beginning balance 324,185 325,950 297,686 313,545  
Revenue recognized, included in beginning balance (99,376) (119,023) (155,379) (142,960)  
Additions, net of revenue recognized during period 92,489 118,657 174,991 154,999  
Ending balance 317,298 325,584 317,298 325,584  
Deferred income from leases 59,814 61,937 59,814 61,937  
Total deferred income 377,112 387,521 377,112 387,521  
Less: Non-current portion, included in other long-term liabilities 140,294 154,315 140,294 154,315  
Total deferred income, current portion $ 236,818 $ 233,206 $ 236,818 $ 233,206 $ 186,404