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Restricted Unit Awards - Summary of Nonvested Restricted Units (Details) - Restricted Unit Awards [Member]
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Restricted Units Awarded  
Beginning Balance | shares 158,304
Granted | shares 173,138
Ending Balance | shares 331,442
Weighted-average Grant-Date Fair Value  
Beginning Balance | $ / shares $ 6.03
Granted | $ / shares 5.70
Ending Balance | $ / shares $ 5.86