Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                              
Repurchase of debt                     $ 11,500 $ 35,900 $ 39,300 $ 188,900 $ 787,800
Gain on extinguishment of debt                     500 $ 4,600 24,100 81,100 $ 521,100
GAAP gain                         23,200 66,100  
Face value of debt repurchased related to GAAP portion                         $ 34,100 $ 171,800  
Debt cancelled in securitization                 $ 173,200            
Net operating loss carryforwards         $ 443,700         $ 443,700          
Net operating loss carryforwards expiration                   20 years          
Increase in income taxes receivable related to tax cuts and jobs act                 600            
Income tax expense (benefit) $ (82) $ (2) $ 510 $ 539 $ 45 $ (38) $ 138 $ 44 965 $ 189 $ 345        
Capital Loss Carryforward                              
Operating Loss Carryforwards [Line Items]                              
Capital loss carryforward $ 23,100               $ 23,100