INCOME TAXES - Unrecognized tax benefits (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2020
USD ($)
item
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
| Reconciliation of the change in the amount of unrecognized tax benefits | |||
| Balance at beginning of period | $ 31,000 | $ 22,000 | $ 15,300 |
| Gross increases-current period tax positions | 4,800 | 10,500 | 7,300 |
| Gross decreases-tax position in prior periods | (1,300) | (1,500) | (600) |
| Gross decreases-expiration of statute of limitations | (1,000) | ||
| Balance at end of period | 33,500 | 31,000 | 22,000 |
| Interest expense recognized | 0 | 0 | $ 0 |
| Unrecognized tax benefits that would impact the effective tax rate | 6,900 | 12,200 | |
| Unrecognized tax positions | $ 7,200 | ||
| Number of subsidiaries files income tax returns in the U.S. federal jurisdiction, and various state and foreign jurisdictions | item | 1 | ||
| State | |||
| Reconciliation of the change in the amount of unrecognized tax benefits | |||
| Interest expense recognized | $ 1,100 | 0 | |
| Penalties | 500 | ||
| Accrued interest and penalties | $ 1,600 | $ 100 | |