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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of income tax expense computed at the federal statutory rate to the provision for income taxes      
Federal income tax expense at statutory rate $ 11,709 $ 18,520 $ 22,294
State taxes, net of federal benefit 2,349 1,539 2,547
Change in uncertain tax positions, net (1,292) 1,043 50
Research and development credit (226) (160) (274)
Rate change 287 240 64
Manufacturing tax benefits   (933) (1,248)
Prior period adjustments     1,096
Federal deferred rate change (836) (22,452)  
Other (137) (206) 158
Provision for income tax expense (benefit) $ 11,854 $ (2,409) $ 24,687