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Equity Incentive Plan - Schedule of LTIP Unit Awards (Details) - Long Term Incentive Plan Units - $ / shares
12 Months Ended
Sep. 09, 2010
Apr. 21, 2010
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Number of Shares, Nonvested at beginning of the period (in shares)     295,551 183,300 51,555
Number of Shares, Granted (in shares) 26,250 246,960 223,922 112,251 183,300
Number of Shares, Vested (in shares)     (37,417) 0 (51,555)
Number of Shares, Nonvested at end of the period (in shares)     482,056 295,551 183,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Weighted - Average Grant Date Fair Value, Nonvested at beginning of the period (in dollars per share)     $ 14.36 $ 14.13 $ 15.18
Weighted - Average Grant Date Fair Value, Granted (in dollars per share)     19.2 14.73 14.13
Weighted - Average Grant Date Fair Value, Vested (in dollars per share)     14.73 0.00 15.18
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share)     $ 16.58 $ 14.36 $ 14.13