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Unit-Based Compensation - LTIP, Unit Appreciation Rights and Unit Options (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jun. 11, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual interest rate 1.50%      
Unit appreciation rights (UARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation. gross 21,500      
Unit award expiration period 7 years      
Share-based compensation expense $ 16,359 $ 256,674    
Unrecognized compensation costs $ 16,867      
Unrecognized compensation costs, weighted-average remaining period for recognition 2 years 2 months 28 days      
Volatility 41.00%      
Share based compensation, forfeiture rate 4.70%      
Annual distribution rate per unit (in dollars per share) $ 1.4      
Annual interest rate 1.50%      
Unit appreciation rights (UARs) | Ratable vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation. gross 21,500   136,100  
Award vesting period 3 years   3 years  
Unit appreciation rights (UARs) | Cliff vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation. gross     105,174  
Award vesting period     3 years  
Restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,200,000 1,100,000    
Unrecognized compensation costs $ 6,100,000      
Unrecognized compensation costs, weighted-average remaining period for recognition 2 years 6 months 24 days      
Phantom share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 1,400,000 $ 1,000,000    
Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units authorized for issuance (in shares) 5,000,000     2,000,000
Units issued as compensation (in shares) 2,180,140      
Long Term Incentive Plan | Unit option awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation (in shares) 266,014      
Long Term Incentive Plan | Restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation (in shares) 855,534      
Long Term Incentive Plan | Phantom share units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation (in shares) 862,064      
Long Term Incentive Plan | Unrestricted units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units issued as compensation (in shares) 196,528