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Income Taxes - Schedule of Significant Components of the Income Tax Expense (benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
U.S. federal $ 254 $ 5,966 $ 1,001
U.S. state and local 953 598  
Non-U.S. 220    
Total current income tax expense 1,427 6,564 1,001
Deferred      
U.S. federal 11,133 (110,361) (538)
U.S. state and local 5,560 1,516 125
Total deferred income tax expense 16,693 (108,845) (413)
Income tax expense (benefit) $ 18,120 $ (102,281) [1] $ 588 [2]
[1] The income tax benefit for the year ended December 31, 2017 is based upon seven months of Cars.com, LLC activity and twelve months of DealerRater activity.
[2] As a partnership, Cars.com, LLC generally was not subject to federal and state income tax. Therefore, the income tax benefit is based upon five months of DealerRater post-acquisition activity.