SHARE-BASED COMPENSATION - Non Cash Stock Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Stock-based compensation expense included in operating expenses | $ 1,945 | $ 3,341 | $ 6,168 | $ 10,286 |
| Income tax benefit | 480 | 770 | 1,452 | 2,258 |
| After-tax stock-based compensation expense | 1,465 | 2,571 | 4,716 | 8,028 |
| Station operating expenses | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Stock-based compensation expense included in operating expenses | 524 | 1,107 | 1,552 | 3,765 |
| Corporate general and administrative expenses | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Stock-based compensation expense included in operating expenses | $ 1,421 | $ 2,234 | $ 4,616 | $ 6,521 |