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Partners' Capital - Earnings Per Common and Subordinated Unit & Incentive Distribution Rights (Details)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Phantom units  
Partners' Capital  
Anti-dilutive phantom units excluded | shares 324,000
Limited partner | Incentive Distribution Rights | Minimum Quarterly Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 98.80%
Limited partner | Incentive Distribution Rights | First Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 98.80%
Limited partner | Incentive Distribution Rights | Second Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 85.80%
Limited partner | Incentive Distribution Rights | Third Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 75.80%
Limited partner | Incentive Distribution Rights | Thereafter  
Incentive Distribution Rights  
Marginal percentage interest in distributions 50.80%
General partner  
Incentive Distribution Rights  
General Partner, interest (as a percent) 1.20%
General partner | Incentive Distribution Rights | Minimum Quarterly Distribution  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.425
Marginal percentage interest in distributions 1.20%
General Partner, interest (as a percent) 1.20%
General partner | Incentive Distribution Rights | First Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 1.20%
General Partner, interest (as a percent) 1.20%
General partner | Incentive Distribution Rights | First Target Distribution | Maximum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.4888
General partner | Incentive Distribution Rights | Second Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 14.20%
General Partner, interest (as a percent) 14.20%
General partner | Incentive Distribution Rights | Second Target Distribution | Minimum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.4888
General partner | Incentive Distribution Rights | Second Target Distribution | Maximum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.5313
General partner | Incentive Distribution Rights | Third Target Distribution  
Incentive Distribution Rights  
Marginal percentage interest in distributions 24.20%
General Partner, interest (as a percent) 24.20%
General partner | Incentive Distribution Rights | Third Target Distribution | Minimum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.5313
General partner | Incentive Distribution Rights | Third Target Distribution | Maximum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.6375
General partner | Incentive Distribution Rights | Thereafter  
Incentive Distribution Rights  
Marginal percentage interest in distributions 49.20%
General Partner, interest (as a percent) 49.20%
General partner | Incentive Distribution Rights | Thereafter | Minimum  
Incentive Distribution Rights  
Quarterly distribution per unit (in dollars per share) $ 0.6375