Annual report pursuant to Section 13 and 15(d)

EQUITY-BASED AWARDS - LTIP Units (Details)

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EQUITY-BASED AWARDS - LTIP Units (Details) - 2013 Long-Term Incentive Plan [Member] - LTIP units [Member] - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of LTIP units      
Outstanding unvested at beginning of year (in shares) 236,265 509,166 287,600
Granted (in shares) 177,546 6,000 378,550
Vested (in shares) (119,282) (278,901) (156,984)
Unvested at end of year (in shares) 294,529 236,265 509,166
Weighted Average Grant-Date Fair Value      
Outstanding unvested at beginning of year (in dollars per share) $ 10.41 $ 10.07 $ 9.28
Granted (in dollars per share) 17.59 13.00 10.37
Vested (in dollars per share) 10.41 9.84 9.35
Unvested at end of year (in dollars per share) $ 14.74 $ 10.41 $ 10.07