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Income Taxes - Summary of income tax provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
Federal $ 5,155 $ 7,020 $ 9,838
State 3,310 1,557 2,871
Current Income Tax Expense (Benefit) 8,465 8,577 12,709
Deferred      
Federal 4,936 (1,453) 2,491
Foreign (822) (875) 481
State (805) (2,763) 1,233
Deferred Income Tax Expense (Benefit) 3,309 (5,091) 4,205
Income tax expense $ 11,774 $ 3,486 $ 16,914