Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Level 1 | ||
| Fair Value Assets Liabilities Measured On Recurring Basis [Line Items] | ||
| Deferred Compensation Liability | $ 0 | $ 0 |
| Level 2 | ||
| Fair Value Assets Liabilities Measured On Recurring Basis [Line Items] | ||
| Deferred Compensation Liability | (10,389) | (12,927) |
| Level 3 | ||
| Fair Value Assets Liabilities Measured On Recurring Basis [Line Items] | ||
| Deferred Compensation Liability | $ 0 | $ 0 |