RECENT ACCOUNTING PRONOUNCEMENTS Lease Standard - Effect on Statement of Consolidated Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		$ 825,000
Total revenue	$ 2,180,327	1,904,205
Other operating expenses	33,626	32,975
Selling, general and administrative expenses	231,325	207,828
Interest expense	55,336	38,160
Restructuring and other items, net	6,178	15,121
Earnings from continuing operations before income taxes	68,151	52,699
Provision for income taxes	22,261	15,386
Earnings from continuing operations	45,890	37,313
Net earnings	45,316	36,886
Comprehensive income	$ 66,532	$ 54,257
Earnings per common share - Basic
Continuing operations (in dollars per share)	$ 0.87	$ 0.71
Net earnings (in dollars per share)	0.86	0.70
Earnings per common share - Diluted
Continuing operations (in dollars per share)	0.87	0.70
Net earnings (in dollars per share)	$ 0.86	$ 0.70
Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		$ 824,300
Total revenue		1,903,500
Other operating expenses		33,500
Selling, general and administrative expenses		208,600
Interest expense		37,800
Restructuring and other items, net		16,000
Earnings from continuing operations before income taxes		48,100
Provision for income taxes		14,200
Earnings from continuing operations		33,900
Net earnings		33,500
Comprehensive income		$ 51,000
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0.65
Net earnings (in dollars per share)		0.64
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0.64
Net earnings (in dollars per share)		$ 0.63
Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Earnings from continuing operations		$ 3,400
Net earnings		3,400
Service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold	$ 971,690	788,771
Service | Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		787,200
Lease, Related Maintenance and Rental
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold	$ 664,289	615,605
Lease, Related Maintenance and Rental | Accounting Standards Update 2016-02 | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		619,200
Lessor Adjustments | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		500
Total revenue		500
Other operating expenses		0
Selling, general and administrative expenses		(400)
Interest expense		0
Restructuring and other items, net		0
Earnings from continuing operations before income taxes		4,500
Provision for income taxes		1,200
Earnings from continuing operations		3,300
Net earnings		3,300
Comprehensive income		$ 3,400
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0.06
Net earnings (in dollars per share)		0.06
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0.06
Net earnings (in dollars per share)		$ 0.06
Lessor Adjustments | Service | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		$ 0
Lessor Adjustments | Lease, Related Maintenance and Rental | Accounting Standards Update 2016-02 | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		(3,600)
Lessee and Other Adjustments | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		300
Total revenue		300
Other operating expenses		(500)
Selling, general and administrative expenses		(400)
Interest expense		400
Restructuring and other items, net		(900)
Earnings from continuing operations before income taxes		100
Provision for income taxes		0
Earnings from continuing operations		100
Net earnings		100
Comprehensive income		$ 0
Earnings per common share - Basic
Continuing operations (in dollars per share)		$ 0.00
Net earnings (in dollars per share)		0.00
Earnings per common share - Diluted
Continuing operations (in dollars per share)		0.00
Net earnings (in dollars per share)		$ 0.00
Lessee and Other Adjustments | Service | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		$ 1,500
Lessee and Other Adjustments | Lease, Related Maintenance and Rental | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of services sold		0
Prior Period Error | New Lease Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease & related maintenance and rental revenues		4,700
Cost of services sold		$ 4,700