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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax expense | $ 1,907 | $ 1,764 | $ 2,346 | $ 12,829 |
Effective Income Tax Rate, Continuing Operations | 47.50% | 11.40% | 48.60% | 31.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 35.00% | 35.00% | 35.00% |
Liability for gross unrecognized tax benefits | $ 710 |  | $ 710 |  | $ 788
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 535 |  | 535 |  | 579
Accrual for interest and penalties | $ 89 |  | $ 89 |  | $ 86

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