Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Rentals Revenue
Initial direct costs included in rental property and equipment	$ 10,000	$ 11,000
Amortization of initial direct costs	$ 5,000	7,000	$ 8,000
Deferred Marketing Costs
Capitalization period for deferred marketing costs	8 years
Deferred marketing costs included in other assets	$ 36,000	38,000
Deferred costs expensed	13,000	15,000	18,000
New Accounting Pronouncements
Net cash provided by operating activities	(495,813)	(496,122)	(522,989)
Net cash used in financing activities	(367,747)	229,529	578,658
Accounting Standards Update 2016-15
New Accounting Pronouncements
Early extinguishment of debt	$ 7,000
Accounting Standards Update 2016-09
New Accounting Pronouncements
Net cash provided by operating activities		5,000	8,000
Net cash used in financing activities		$ 5,000	$ 8,000
Minimum
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets, estimated useful lives	1 year
Maximum
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets, estimated useful lives	15 years
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	50 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	12 years
Rental equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Rental equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	6 years
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Software development costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Software development costs | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years