Consolidated Balance Sheets (Parenthetical) - shares	Dec. 31, 2019	Dec. 31, 2018
Partners' capital:
Limited partner interest, units issued (in shares)	82,985,941	82,665,057
Limited partner interest, units outstanding (in shares)	82,985,941	82,665,057
Common Units - Public [Member]
Partners' capital:
Limited partner interest, units outstanding (in shares)	54,521,974
Class C Units Subsidiary [Member]
Partners' capital:
Limited partner interest, units issued (in shares)	16,410,780	16,410,780
Limited partner interest, units outstanding (in shares)	16,410,780	16,410,780