INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current [Abstract]
Federal		$ 0	$ 0	$ 0
State		150	200	242
Total		150	200	242
Deferred [Abstract]
Federal		(424)	0	0
State		0	0	0
Total		(424)	0	0
Total (benefit) provision		(274)	200	242
Noncurrent deferred tax assets (liabilities) [Abstract]
Allowance for bad debts		3,792	5,904
Accrued rent		1,723	3,191
Accrued bonus		0	1,429
Accrued benefits		105	198
Stock-based compensation		387	557
Depreciation		15,520	20,372
Goodwill		594	1,959
Other intangibles		291	562
Pension plan liabilities		1,221	2,142
Net operating loss carryforwards		17,367	17,846
AMT credit		424	424
Total noncurrent deferred tax assets		41,424	54,584
Less valuation allowance		(41,000)	(54,584)
Noncurrent deferred tax assets, net of valuation allowance		$ 424	0
Income Tax Disclosure [Line Items]
Federal corporate tax rate		35.00%
Provisional deferred tax expense (benefit)		$ (17,700)
Difference between the actual tax provision and the tax provision that would result from the use of the Federal statutory rate [Abstract]
Loss before taxes		(11,758)	(28,104)	(3,108)
Expected tax benefit		(4,115)	(9,836)	1,088
State tax benefit (net of federal)		150	200	242
Valuation allowance		(13,920)	9,726	(1,228)
Federal tax reform - deferred rate change		17,671	0	0
Other		(60)	110	140
Total (benefit) provision		$ (274)	$ 200	$ 242
Expected tax benefit		35.00%	35.00%	35.00%
State tax benefit (net of federal)		(1.30%)	(0.70%)	7.80%
Valuation allowance		118.40%	(34.60%)	(39.50%)
Federal tax reform - deferred rate change		(150.30%)	0.00%	0.00%
Other		0.50%	(0.40%)	4.50%
Total		2.30%	(0.70%)	7.80%
Net operating loss carryforwards		$ 57,700	$ 39,700
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit		400
Tax cuts and jobs act of 2017, change in tax rate, income tax expense		$ 100
Net operating loss carryforwards, period of ownership change		3 years
Net operating loss carryforwards, minimum percentage of ownership change		50.00%
Plan [Member]
Income Tax Disclosure [Line Items]
Federal corporate tax rate	21.00%