SHARE-BASED COMPENSATION - Recognized Non-Cash Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock-based compensation expense included in operating expenses | $ 16,184 | $ 15,149 | $ 9,567 |
| Income tax benefit | 3,703 | 3,160 | 3,328 |
| After-tax stock-based compensation expense | 12,481 | 11,989 | 6,239 |
| Station operating expenses | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock-based compensation expense included in operating expenses | 4,673 | 6,855 | 1,694 |
| General and Administrative Expense | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock-based compensation expense included in operating expenses | $ 11,511 | $ 8,294 | $ 7,873 |