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INCOME TAXES - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed expected income tax expense (benefit) at Federal statutory rate	35.00%	35.00%	34.00%
Increase (decrease) resulting from:
Proportional amortization	0.70%	2.10%	6.80%
Other permanent book-tax differences	(0.40%)	0.30%	3.40%
State tax expense, net of federal benefit	6.20%	8.10%	7.20%
Income tax credits	(0.60%)	(0.00%)	(0.00%)
Change in valuation allowance	0.00%	(66.80%)	51.50%
Federal effect of state tax deferred due to the change in valuation allowance	0.00%	7.20%	0.00%
Other, net	(0.40%)	0.00%	(1.80%)
Effective tax rates	40.50%	(14.10%)	101.10%

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Effective Income Tax Rate Reconciliation, Federal Income Tax Rate Adjustments, Percent

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Effective Income Tax Rate Reconciliation, Other Permanent Book to Tax Differences, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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