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Restricted Unit Awards ("RUAs") - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense $ 622,000 $ 550,000 $ 1,400,000 $ 1,200,000
Unrecognized compensation expense related to nonvested RUAs granted $ 1,400,000   $ 1,400,000  
Remaining expense expected to be recognized over a weighted-average period     9 months 18 days  
Intrinsic value of nonvested RUAs     $ 3,100,000  
Burlington [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Approved grant of restricted units and other awards to employees 3,000,000   3,000,000  
RUAs granted with vesting range     3 years  
Burlington [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
RUAs granted with vesting range     3 months