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Omnibus Incentive Compensation Plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 23, 2015
shares
Aug. 21, 2014
shares
Jul. 22, 2010
shares
Apr. 29, 2008
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Units / Shares authorized | shares     850,000        
Share based compensation $ 1,156 $ 1,074 $ 34        
Total compensation cost related to non vested awards $ 1,111            
Expected period of recognition for unrecognized compensation cost 1 year            
Value of unvested units accrued distribution $ 427            
Partnerships Omnibus Incentive Compensation Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Units / Shares authorized | shares         1,650,000 800,000 500,000
Partnerships Omnibus Incentive Compensation Plan Employees              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Units granted | shares       240,000      
Number of annual installments       3      
Vesting date of remaining awards       Dec. 31, 2018      
Partnerships Omnibus Incentive Compensation Plan Non Employees              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Units granted | shares       610,000      
Number of annual installments       3      
Vesting date of remaining awards       Dec. 31, 2018      
Employee equity compensation              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share based compensation 438 439 10        
Total compensation cost related to non vested awards 939 1,141 1,325        
Non-Employee equity compensation              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share based compensation 718 635 24        
Total compensation cost related to non vested awards $ 2,598 $ 2,993 $ 3,367