Income Taxes - Classification of Deferred Taxes on the Consolidated and Combined Balance Sheets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Deferred Tax Liabilities, Net, Classification [Abstract] | ||
| Non-current assets | $ 350 | $ 227 |
| Non-current liabilities | 55,329 | 89,667 |
| Deferred tax liabilities, net | $ 54,979 | $ 89,440 |