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Equity-Based Compensation Plans (Summary of Service-Based and Performance-Based Awards) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Service-Based Awards  
Number of Phantom Units  
Unvested at December 31, 2018 (in units) | shares 195,939
Granted (in units) | shares 29,606
Forfeited (in units) | shares (1,098)
Settled (in units) | shares (76,370)
Unvested at December 31, 2019 (in units) | shares 148,077
Average Grant Date Fair Value  
Unvested at December 31, 2018 (in dollars unit) | $ / shares $ 30.40
Granted (in dollars per unit) | $ / shares 21.28
Forfeited (in dollars per unit) | $ / shares 32.43
Settled (in dollars per unit) | $ / shares 31.79
Unvested at December 31, 2019 (in dollars per unit) | $ / shares $ 27.85
Total Value (in thousands)  
Unvested at December 31, 2018 | $ $ 5,958
Granted | $ 630
Forfeited | $ (36)
Settled | $ (2,428)
Unvested at December 31, 2019 | $ $ 4,124
Performance-Based Awards  
Number of Phantom Units  
Unvested at December 31, 2018 (in units) | shares 378,006
Granted (in units) | shares 0
Forfeited (in units) | shares (1,653)
Settled (in units) | shares (213,582)
Unvested at December 31, 2019 (in units) | shares 162,771
Average Grant Date Fair Value  
Unvested at December 31, 2018 (in dollars unit) | $ / shares $ 31.09
Granted (in dollars per unit) | $ / shares 0
Forfeited (in dollars per unit) | $ / shares 32.43
Settled (in dollars per unit) | $ / shares 30.37
Unvested at December 31, 2019 (in dollars per unit) | $ / shares $ 32.02
Total Value (in thousands)  
Unvested at December 31, 2018 | $ $ 11,754
Granted | $ 0
Forfeited | $ (54)
Settled | $ (6,486)
Unvested at December 31, 2019 | $ $ 5,214