Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES (Details)

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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Effective income tax rate (as a percent) (3.80%) (5.80%) (6.50%) 8.30%  
Tax expense (benefit) computed at the maximum U.S. statutory rate, as a percent     21.00%    
Amount of future financial taxable income needed to realize deferred tax assets $ 259,700 $ 237,600 $ 259,700 $ 237,600  
Income tax expense (benefit) 220 $ 300 505 $ (1,538)  
Unrecognized tax benefits 3,100   3,100   $ 3,300
Accrued interest and penalties related to uncertain income tax positions 2,100   2,100    
Discontinued Operations          
Unrecognized tax benefits 1,200   1,200   $ 1,400
Accrued interest and penalties related to uncertain income tax positions $ 1,700   $ 1,700