INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Aug. 10, 2020	Apr. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income tax receivable			$ 8,200	$ 200
Uncertain tax benefits accrued			2,700	2,700	$ 2,700	$ 2,700
Valuation allowance			3,300	100
Net change in total valuation allowance			3,200	(300)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			100	200	$ 300
Interest and penalties accrued related to uncertain income tax positions			700	600
CARES Act Deferral Of Employer Share Social Security Tax			27,000	55,000
Funding Received From CARES Act		$ 100,000
Provider relief fund advance			$ 0	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			32,468
Executive Stock Option Exercise [Member]
Income Tax Disclosure [Line Items]
Recognized share-based compensation tax benefit				92,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	500,000
Minimum [Member]
Income Tax Disclosure [Line Items]
Tax years open to examination			2007
Maximum [Member]
Income Tax Disclosure [Line Items]
Tax years open to examination			2021
Net Operating Loss [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards			$ 38,800
Net Operating Loss [Member] | 2037 Expiration
Income Tax Disclosure [Line Items]
Net operating loss carryforwards			800
State Tax Credit [Member]
Income Tax Disclosure [Line Items]
Tax credits			3,200
Federal [Member] | Executive Stock Option Exercise [Member]
Income Tax Disclosure [Line Items]
Recognized share-based compensation tax benefit				19,400
State and Local Jurisdiction [Member] | Executive Stock Option Exercise [Member]
Income Tax Disclosure [Line Items]
Recognized share-based compensation tax benefit				$ 4,600
State and Local Jurisdiction [Member] | Net Operating Loss [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards			$ 109,300