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Subsequent Events (Tables)
 12 Months Ended
Dec. 31, 2019
Subsequent Events [Abstract]  
Schedule of Dividends Payable [Table Text Block]
The General Partner's board of directors declared the following dividends/distributions at its regularly scheduled board meeting held on January 29, 2020:
Class of stock/units
Quarterly
Amount per Share or Unit
 
Record Date
 
Payment Date
Common
$
0.235

 
February 14, 2020
 
February 28, 2020