Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Income Tax Disclosure [Abstract] | ||
| U.S Federal statutory rate | 21.00% | |
| Income tax expense | $ 26 | $ 11 |
| Pre-tax income | $ 4,346 | $ 671 |
| Effective tax rate | 0.60% | 1.60% |