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INCOME TAXES - Reconciliation of income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reconciliation of income taxes computed at the United States federal statutory tax rate to income tax benefit (expense)        
Income tax benefit (expense) at U.S. statutory rate $ 37,656 $ (10) $ 73,925 $ 734
Valuation allowance (29,438)   (61,861)  
Share-based compensation (906) (86) (2,298) 456
State income taxes, net of federal benefit (206) 8 (754) (755)
State income taxes, valuation allowance 1,575   1,637  
Non-deductible employee compensation in excess of $1,000 (12) 183 (173) (975)
Non-deductible goodwill impairment (6,568)   (9,214)  
Other (14) 26 (228) (210)
Income tax benefit (expense) 2,087 $ 121 1,034 $ (750)
Valuation allowance $ 60,224   $ 60,224