Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Income Tax Benefit Reconciliation (Details)

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INCOME TAXES - Income Tax Benefit Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]                      
U.S. federal statutory (benefit)                 $ 17,211 $ (6,879) $ (4,268)
Non-controlling interests                 (5,626) 0 0
Earnings as dual-member LLC                 0 0 1,643
State and local income taxes, net                 1,140 (1,564) (2)
Excess tax benefits pursuant to ASU 2016-09                 (37) 309 140
Valuation allowance changes                 (2,945) 9,302 (66)
Intangible assets                 1,056 0 0
Nondeductible items                 233 125 86
Tax credits                 (283) (323) (123)
Other, net                 150 (140) 100
Total income tax expense (benefit) $ (2,020) $ 13,737 $ 415 $ (1,233) $ (1,638) $ (1,736) $ 5,928 $ (1,724) $ 10,899 $ 830 $ (2,490)