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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Noncontrolling Interests in Consolidated Entities (Details)
 12 Months Ended
Dec. 31, 2015
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
Percentage of carried interest received by general partners (up to) 1.00%
Percentage of other profits (losses) received by general partners 1.00%
Series A LLC Preferred Shares | KFN  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
Preferred shares dividend rate (as a percent) 7.375%