GENERAL (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2017
Disaggregation of Revenue [Line Items]
Adjustment to retained earnings	$ 2,343,857		$ 2,337,252
Deferred revenue	583,437		582,078
Capitalized sales commissions	106,000		107,000
Initial direct costs of leases	$ 53,000		53,000
Lease renewal option (in years)	5 years
Operating and finance lease assets	$ 235,055		245,481
Minimum
Disaggregation of Revenue [Line Items]
Payment term of contract with customer	15 days
Lease terms (in years)	3 years
Maximum
Disaggregation of Revenue [Line Items]
Payment term of contract with customer	90 days
Lease terms (in years)	5 years
Accounting Standards Update 2016-02 | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Adjustment to retained earnings				$ 315,000
Maintenance Services
Disaggregation of Revenue [Line Items]
Non-lease revenue from maintenance services	$ 239,000	$ 223,000
Deferred revenue	564,000		566,000
ChoiceLease
Disaggregation of Revenue [Line Items]
Capitalized sales commissions	$ 92,000		$ 93,000