RECENT ACCOUNTING PRONOUNCEMENTS Revenue Recognition - Effect on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	$ 165,626	$ 160,094
Total current assets	1,367,756	1,322,893
Direct financing leases and other assets	630,457	570,706
Total assets	12,228,866	11,463,999
Accrued expenses and other current liabilities	571,777	589,603
Total current liabilities	2,018,564	2,014,975
Other non-current liabilities	822,077	812,642
Deferred income taxes	1,309,445	1,211,129
Total liabilities	9,387,463	8,622,328
Retained earnings	2,580,262	2,471,677
Total shareholders' equity	2,841,403	2,841,671
Total liabilities and shareholders' equity	$ 12,228,866	11,463,999
New Revenue Standard Adjustment | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets		611
Total current assets		611
Direct financing leases and other assets		11,157
Total assets		11,768
Accrued expenses and other current liabilities		2,197
Total current liabilities		2,197
Other non-current liabilities		553
Deferred income taxes		2,363
Total liabilities		5,113
Retained earnings		6,655
Total shareholders' equity		6,655
Total liabilities and shareholders' equity		11,768
As Previously Reported | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets		159,483
Total current assets		1,322,282
Direct financing leases and other assets		559,549
Total assets		11,452,231
Accrued expenses and other current liabilities		587,406
Total current liabilities		2,012,778
Other non-current liabilities		812,089
Deferred income taxes		1,208,766
Total liabilities		8,617,215
Retained earnings		2,465,022
Total shareholders' equity		2,835,016
Total liabilities and shareholders' equity		$ 11,452,231