INCOME TAXES (DTA AND DTL TABLE) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets, gross
Accrued workers compensation, deferred compensation and employee benefits	$ 8,574	$ 7,999
Allowance for doubtful accounts, insurance and other accruals	4,463	3,393
Amortization of deferred lease liabilities	20,352	25,757
Net operating losses	20,508	19,222
Equity compensation	1,660	1,442
Customer acquisition and deferred revenue accruals	6,868	9,047
Federal and state tax credits, net	2,383	1,263
Unrealized losses on derivatives	1,187	1,421
DTA Impairment of equity investment	4,064	4,142
Partnership investment	526	2,435
Other	5,444	1,322
Total deferred tax assets, gross	76,029	77,443
Valuation allowances	(18,697)	(17,051)	$ (10,867)	$ (9,526)
Deferred Tax Assets, Net of Valuation Allowance, Total	57,332	60,392
Deferred tax liabilities
Depreciation and amortization	(10,734)	(6,095)
Unrealized gain on derivatives	(2,959)	(1,491)
Contract acquisition costs	(3,182)	(5,740)
Intangible Assets	(15,880)	(22,585)
DTL Operating lease assets	(16,763)	(21,413)
Other	(480)	(407)
Total deferred tax liabilities	(49,998)	(57,731)
Deferred Tax Assets, Net, Total	$ 7,334	$ 2,661