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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the beginning and ending amount of unrecognized tax benefits:    
Balance, beginning of year $ 2,187 $ 1,816
Additions based on tax positions related to the prior year 3 1,399
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 0 (916)
Settlements with taxing authorities 2,100  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (65) (112)
Balance, end of year 2,125 2,187
Total amount of tax benefits that if recognized would favorable impact the effective tax rate 1,900 1,600
Interest and penalties accrued $ 348 $ 306