SHARE-BASED COMPENSATION - Non Cash Stock Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock-based compensation expense included in operating expenses | $ 1,780 | $ 3,573 |
| Income tax benefit | 368 | 748 |
| After-tax stock-based compensation expense | 1,412 | 2,825 |
| Station operating expenses | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock-based compensation expense included in operating expenses | 502 | 1,416 |
| Corporate general and administrative expenses | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock-based compensation expense included in operating expenses | $ 1,278 | $ 2,157 |