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Income Taxes - Valuation allowances, uncertain tax positions and accrued interest and penalties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation allowance      
Increase (decrease) in valuation allowance $ 2,400 $ 6,500 $ (7,400)
Interest and penalties      
Accrued interest or penalties for income tax liabilities 100 100 100
Change in reserve for uncertain tax benefits      
Reserve at beginning of year 107 662 560
Increases related to prior year tax positions 427 7 217
Lapse of statute of limitations (107) (562) (115)
Total 427 $ 107 $ 662
Uncertain tax positions      
Uncertain tax positions that would impact of effective tax rate 300    
Unrecognized tax benefits estimated decrease $ 400