RECENT ACCOUNTING PRONOUNCEMENTS Revenue Recognition - Effect on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	$ 169,175	$ 160,094
Total current assets	1,464,656	1,322,893
Direct financing leases and other assets	652,249	570,706
Total assets	12,684,305	11,463,999
Accrued expenses and other current liabilities	618,675	589,603
Total current liabilities	2,182,818	2,014,975
Other non-current liabilities	828,149	812,642
Deferred income taxes	1,331,360	1,211,129
Total liabilities	9,765,907	8,622,328
Retained earnings	2,632,589	2,471,677
Total shareholders' equity	2,918,398	2,841,671
Total liabilities and shareholders' equity	$ 12,684,305	11,463,999
As Previously Reported | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets		159,500
Total current assets		1,322,300
Direct financing leases and other assets		559,500
Total assets		11,452,200
Accrued expenses and other current liabilities		587,400
Total current liabilities		2,012,800
Other non-current liabilities		812,100
Deferred income taxes		1,208,800
Total liabilities		8,617,200
Retained earnings		2,465,000
Total shareholders' equity		2,835,000
Total liabilities and shareholders' equity		11,452,200
New Revenue Standard Adjustment | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets		600
Total current assets		600
Direct financing leases and other assets		11,200
Total assets		11,800
Accrued expenses and other current liabilities		2,200
Total current liabilities		2,200
Other non-current liabilities		600
Deferred income taxes		2,400
Total liabilities		5,100
Retained earnings		6,700
Total shareholders' equity		6,700
Total liabilities and shareholders' equity		$ 11,800