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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of the phantom unit award activity and changes under the LTIP
A summary of phantom unit award activity and changes under the LTIP during the year ended December 31, 2020 is presented below:
(in thousands, except per unit data)Units
Weighted-
Average
Grant Date
Fair Value
Aggregate
Intrinsic
Value
Non-vested at December 31, 2019155,707 $30.71 $4,827 
Granted444,385 12.12 
Vested(62,594)31.31 
Forfeited(18,617)31.23 
Non-vested at December 31, 2020518,881 $14.70 $8,312