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 |