Income Taxes - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Income Tax Expense Benefit [Line Items] | ||
| Effective tax rate | 5.00% | (4.50%) |
| Income tax expense (benefit) | $ (2,445) | $ 2,358 |
| Without Adoption (ASC 605) | ||
| Income Tax Expense Benefit [Line Items] | ||
| Effective tax rate | (4.30%) | |
| Income tax expense (benefit) | $ 3,300 | |