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Restricted Unit Awards ("RUAs") - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense $ 544,000 $ 439,000 $ 750,000 $ 610,000
Unrecognized compensation expense related to nonvested RUAs granted $ 2,000,000   $ 2,000,000  
Remaining expense expected to be recognized over a weighted-average period     1 year 1 month 6 days  
Intrinsic value of nonvested RUAs     $ 3,500,000  
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