XML 49 R106.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Equity-Based Compensation Plans (Summary of Service-Based and Performance-Based Awards) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Service-Based Awards  
Number of Phantom Units  
Unvested at December 31, 2017 (in units) | shares 239,837
Granted (in units) | shares 28,484
Forfeited (in units) | shares (17,073)
Settled (in units) | shares (55,309)
Unvested at December 31, 2018 (in units) | shares 195,939
Average Grant Date Fair Value  
Unvested at December 31, 2017 (in dollars unit) | $ / shares $ 34.81
Granted (in dollars per unit) | $ / shares 22.12
Forfeited (in dollars per unit) | $ / shares 31.46
Settled (in dollars per unit) | $ / shares 44.92
Unvested at December 31, 2018 (in dollars per unit) | $ / shares $ 30.40
Total Value (in thousands)  
Unvested at December 31, 2017 | $ $ 8,349
Granted | $ 630
Forfeited | $ (537)
Settled | $ (2,484)
Unvested at December 31, 2018 | $ $ 5,958
Performance-Based Awards  
Number of Phantom Units  
Unvested at December 31, 2017 (in units) | shares 582,375
Granted (in units) | shares 0
Forfeited (in units) | shares (67,266)
Settled (in units) | shares (137,103)
Unvested at December 31, 2018 (in units) | shares 378,006
Average Grant Date Fair Value  
Unvested at December 31, 2017 (in dollars unit) | $ / shares $ 34.73
Granted (in dollars per unit) | $ / shares 0
Forfeited (in dollars per unit) | $ / shares 33.49
Settled (in dollars per unit) | $ / shares 45.40
Unvested at December 31, 2018 (in dollars per unit) | $ / shares $ 31.09
Total Value (in thousands)  
Unvested at December 31, 2017 | $ $ 20,228
Granted | $ 0
Forfeited | $ (2,253)
Settled | $ (6,224)
Unvested at December 31, 2018 | $ $ 11,751