Acquisitions and Dispositions of Businesses (Assets Acquired and Liabilities Assumed) (Details 1) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,362,191	$ 1,388,279
Floor plan payables		(25,800)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable		6,762
Inventory		34,134
Property, plant and equipment		56,391
Lease Right-of-Use Assets		98,505
Goodwill		84,515
Indefinite-lived intangible assets		46,900
Amortized intangible assets		21,291
Other assets		8,308
Floor plan payables		(25,755)
Other liabilities		(42,555)
Deferred income tax liability		(2,703)
Current and noncurrent lease liabilities		(99,131)
Redeemable noncontrolling interest		(1,715)
Noncontrolling interest		(1,154)
Aggregate purchase price, net of cash acquired		$ 183,793