Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS (Narrative) (Details)

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DISCONTINUED OPERATIONS (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of investments   $ 2,777,808 $ 1,425,480 $ 798,580
Repayments of debt obligations   $ 2,788,183 $ 1,983,438 $ 831,042
Disposed of by sale | Beavercreek, OH Planned Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of investments $ 7,000      
Gain on sale of properties 300      
Repayments of debt obligations $ 6,000