INCOME TAXES (Computation of Income Tax Expense by Applying Federal Corporate Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 8,480	$ 103,540	$ 73,218
Tax computed at the U.S. federal statutory rate	1,781	21,743	15,376
Increase (decrease) in valuation allowance, net	11,822	4,419	8,033
State income taxes, net of federal income tax expense (benefit)	(2,608)	417	(3,713)
Tax expense (benefit) from other change in rates, prior period adjustments and other permanent differences	2,079	179	(1,442)
Tax expense (benefit) on equity compensation	192	(317)	(1,490)
Tax expense on compensation disallowance	1,553	2,804	1,168
Deconsolidation of 110 North Wacker	(4,826)	0	0
Tax expense (benefit) on historic tax credit	1,660	0	(2,440)
Income tax expense (benefit)	$ 11,653	$ 29,245	$ 15,492
Effective tax rate	137.40%	28.20%	21.20%