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INCOME TAXES - Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of the United States federal statutory income tax rate to our effective tax rate on income      
United States federal statutory tax rate (as a percent) 35.00% 35.00% 35.00%
State income taxes, net of federal (as a percent) 6.00% 5.00% 6.00%
Valuation allowance (as a percent) 199.00% (7.00%)  
Cancellation of debt income (as a percent) (288.00%)    
Stock-based compensation (as a percent) 3.00%    
Federal effect of state taxes on the above items (as a percent) 5.00% 2.00%  
Other (as a percent) 1.00%    
Effective tax rate (as a percent) (39.00%) 35.00% 41.00%