Acquisitions and Dispositions of Businesses (Assets Acquired and Liabilities Assumed) (Details 1) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,440,379	$ 1,388,279
Floor plan payables		(25,800)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable	745	6,762
Inventory	3,496	34,134
Property, plant and equipment	3,346	56,391
Lease Right-of-Use Assets	6,556	98,505
Goodwill	76,920	84,669
Indefinite-lived intangible assets	0	46,900
Amortized intangible assets	14,589	21,291
Other assets	1,054	8,308
Deferred income tax asset	13,476
Deferred income tax liability		(2,703)
Floor plan payables	0	(25,755)
Other liabilities	(15,451)	(42,555)
Current and noncurrent lease liabilities	(6,601)	(99,131)
Redeemable noncontrolling interest	(6,005)	(1,715)
Noncontrolling interest	0	(1,154)
Aggregate purchase price, net of cash acquired	$ 92,125	$ 183,947