Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) market	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Other receivables	$ 91,000	$ 75,000
Research and development	51,258	58,523	$ 60,857
Selling, general and administrative	1,003,989	1,002,935	1,029,494
Decrease in short-term finance receivables	629,643	653,236
Increase in long-term finance receivables	625,487	635,908
Deferred Charges
Unamortized contract costs	26,048	20,420
Amortization expense	7,000	9,000
New Accounting Pronouncements
Retained earnings	$ 5,438,930	5,279,682
ASU 2014-09
New Accounting Pronouncements
Retained earnings					$ 9,000
ASU 2016-06
New Accounting Pronouncements
Retained earnings		3,000
ASU 2018-02
New Accounting Pronouncements
Retained earnings		116,000
ASU 2016-02
New Accounting Pronouncements
Retained earnings				$ (137,000)
Maximum
Intangible assets
Finite-lived intangible assets, estimated useful lives	10 years
Buildings
Fixed Assets
Estimated useful lives	50 years
Building improvements | Minimum
Fixed Assets
Estimated useful lives	10 years
Building improvements | Maximum
Fixed Assets
Estimated useful lives	20 years
Software development costs | Minimum
Fixed Assets
Estimated useful lives	3 years
Machinery and equipment | Minimum
Fixed Assets
Estimated useful lives	3 years
Machinery and equipment | Maximum
Fixed Assets
Estimated useful lives	12 years
Rental equipment | Minimum
Fixed Assets
Estimated useful lives	4 years
Rental equipment | Maximum
Fixed Assets
Estimated useful lives	6 years
Disposed of by Sale
Property, Plant and Equipment [Line Items]
Number of smaller markets sold | market	6
Loss on sale	$ 181,313	60,611
Other receivables	24,000
Rentals
Property, Plant and Equipment [Line Items]
Cost of products and sales	31,530	37,178	33,741
Support services
Property, Plant and Equipment [Line Items]
Cost of products and sales	162,300	178,495	173,555
Adjustment
Property, Plant and Equipment [Line Items]
Research and development		(29,000)	(15,000)
Cost of products and sales		(13,000)	(3,000)
Selling, general and administrative		(30,000)	(11,000)
Decrease in short-term finance receivables		106,000
Decrease in advance billings		6,000
Increase in long-term finance receivables		100,000
Adjustment | Equipment Sales
Property, Plant and Equipment [Line Items]
Cost of products and sales		(12,000)	(7,000)
Adjustment | Equipment Sales | Income Statement Adjustment
Property, Plant and Equipment [Line Items]
Cost of products and sales		(5,000)	(3,000)
Adjustment | Rentals | Income Statement Adjustment
Property, Plant and Equipment [Line Items]
Cost of products and sales		(3,000)
Adjustment | Support services | Income Statement Adjustment
Property, Plant and Equipment [Line Items]
Cost of products and sales		8,000	$ 6,000
Other Assets
Deferred Charges
Unamortized contract costs	26,000	$ 20,000
Other Expense | Disposed of by Sale
Property, Plant and Equipment [Line Items]
Loss on sale	$ 18,000