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Equity-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 1,919 | $ 1,971 | $ (4,577)
Service-Based Phantom Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Phantom units awarded during the period (in units) | 29,606 |  |
Weighted average grant date fair value of phantom unit (in dollars per unit) | $ 21.28 |  |
Performance-Based Phantom Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Phantom units awarded during the period (in units) | 0 |  |
Weighted average grant date fair value of phantom unit (in dollars per unit) | $ 0 |  |
2010 Plan | Phantom Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Phantom units awarded during the period (in units) | 29,606 | 28,484 | 297,214
Weighted average grant date fair value of phantom unit (in dollars per unit) | $ 21.28 | $ 22.12 | $ 32.37
Unrecognized compensation cost | $ 200 |  |
Weighted average period of recognition, years | 3 months 18 days |  |
Compensation expense | $ 1,800 | $ 2,100 |
Liability for compensation awards | $ 2,800 | $ 3,300 |
2010 Plan | Service-Based Phantom Units | Anniversary Year 1 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%
2010 Plan | Service-Based Phantom Units | Anniversary Year 2 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%
2010 Plan | Service-Based Phantom Units | Anniversary Year 3 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%
2010 Plan | Performance-Based Phantom Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 0.00%
2010 Plan | Performance-Based Phantom Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 150.00%
2010 Plan | Performance-Based Phantom Units | Anniversary Year 1 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%
2010 Plan | Performance-Based Phantom Units | Anniversary Year 2 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%
2010 Plan | Performance-Based Phantom Units | Anniversary Year 3 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage |  |  | 33.33%

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