Partners' Capital and Distributions (Schedule Of Distributions) (Details) - USD ($) $ / shares in Units, $ in Thousands |
9 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Nov. 14, 2019 |
Aug. 14, 2019 |
May 15, 2019 |
Feb. 14, 2019 |
Nov. 14, 2018 |
Aug. 14, 2018 |
May 15, 2018 |
Feb. 14, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Distribution Made to Limited Partner [Line Items] | ||||||||||||
| Cash distribution per unit (in dollars per share) | $ 1.0125 | $ 1.0050 | $ 0.9975 | $ 0.9775 | $ 0.9575 | $ 0.9375 | $ 0.9200 | $ 3.0150 | $ 2.8150 | $ 3.7925 | ||
| Total Cash Distribution to Limited Partners | $ 231,258 | $ 229,545 | $ 227,832 | $ 223,061 | $ 218,497 | $ 213,933 | $ 209,940 | $ 688,635 | $ 642,370 | $ 865,431 | ||
| Scenario, Forecast | ||||||||||||
| Distribution Made to Limited Partner [Line Items] | ||||||||||||
| Cash distribution per unit (in dollars per share) | $ 1.02 | $ 4.0350 | ||||||||||
| Total Cash Distribution to Limited Partners | $ 232,971 | $ 921,606 | ||||||||||