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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
U.S. federal $ 8,446 $ 9,877 $ 8,656
State and local 4,218 3,867 1,808
Foreign 449 553  
Current income tax expense (benefit) 13,113 14,297 10,464
Deferred:      
U.S. federal (700) (2,847) 3,763
State and local (913) (921) (136)
Deferred income tax expense (benefit) (1,613) (3,768) 3,627
Total:      
U.S. federal 7,746 7,030 12,419
State and local 3,305 2,946 1,672
Foreign 449 553  
Income tax expense (benefit) $ 11,500 $ 10,529 $ 14,091