Acquisitions (Details 1) $ in Thousands	Dec. 31, 2016 USD ($)
Autoweb [Member]
Total tangible assets acquired	$ 4,456
Total liabilities assumed	543
Net identifiable assets acquired	4,456
Definite-lived intangible assets acquired	17,690
Goodwill	5,954
Net assets acquired	27,557
Dealix/Autotegrity [Member]
Total tangible assets acquired	9,778
Total liabilities assumed	2,520
Net identifiable assets acquired	7,258
Definite-lived intangible assets acquired	7,655
Indefinite-lived intangible assets acquired	2,200
Goodwill	7,358
Net assets acquired	24,471
Auto USA [Member]
Net identifiable assets acquired	758
Definite-lived intangible assets acquired	3,660
Goodwill	7,346
Net assets acquired	$ 11,764