Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
|
| Income tax benefit | $ (116) | $ (2,786) | |
| Effective income tax rate (as a percent) | 14.00% | 142.00% | |
| U.S. federal statutory rate (as a percent) | 21.00% | 34.00% | |
| Provisional, one-time tax expense | $ 9,000 | ||
| Valuation allowance decrease | 9,000 | ||
| Net tax expense or benefit | 0 | ||
| AMT credit carryforwards, one-time tax benefit | 400 | ||
| AMT valuation allowance decrease | 400 | ||
| Tax benefit arising from Tax Act | 200 | ||
| Unrepatriated foreign earnings, incomplete accounting for tax effect | $ 0 | ||
| State | |||
| Net operating losses | 67,800 | ||
| Tax credit carryforwards | 2,800 | ||
| Federal | |||
| Net operating losses | 66,700 | ||
| Tax credit carryforwards | $ 6,600 | ||