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Description of Business and Basis of Presentation (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2019 USD ($) market	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other receivables		$ 102,000		$ 102,000		$ 75,000
Decrease to research and development		(12,272)	$ (15,636)	(38,421)	$ (44,651)
Increase to selling, general and administrative		254,092	241,350	757,228	759,469
Decrease in short-term finance receivables		(617,178)		(617,178)		(653,236)
Decrease in advance billings		(106,968)		(106,968)		(116,862)
Increase in long-term finance receivables		616,746		616,746		635,908
Retained earnings		(5,270,741)		(5,270,741)		(5,279,682)
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings							$ 137,000
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to research and development			8,000		20,000
Increase to selling, general and administrative			9,000		22,000
Decrease in short-term finance receivables						106,000
Decrease in advance billings						6,000
Increase in long-term finance receivables						$ 100,000
Business services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales		338,519	287,237	1,003,483	872,183
Business services \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales			(4,000)		(10,000)
Equipment sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales		59,859	52,209	182,094	173,626
Equipment sales \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales			3,000		8,000
Equipment sales \| Income Statement Adjustment \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales			(1,000)		(4,000)
Rentals
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales		5,090	9,174	23,223	30,386
Rentals \| Income Statement Adjustment \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales					(3,000)
Support services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales		41,086	45,872	123,453	134,204
Support services \| Income Statement Adjustment \| Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cost of products and sales			2,000		7,000
Disposed of by Sale
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of smaller markets sold \| market	6
Loss on sale	$ (18,000)	$ 18,157	$ (86,640)	$ 29,178	$ (77,863)