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Capital - Earnings Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                              
Net income $ 710 $ (12,269) $ (19,618) $ 8,288 $ 28,720 $ 26,784 $ 18,930 $ 9,856 $ 39,781 $ 29,230 $ 30,184 $ 18,058 $ (22,889) $ 84,290 $ 117,253
Private perpetual preferred unit distributions                         (4,197) (1,743) (936)
Earnings allocated to unvested shares                         (985) (885) (851)
Net income (loss) attributable to common unitholders - basic and diluted                         $ (28,071) $ 81,662 $ 115,466
Denominator:                              
Weighted average units outstanding - basic and diluted (in shares)                         283,826,000 297,798,000 297,258,000
Effect of dilutive securities, stock-based compensation plans (in shares)                         11,000 0 1,000
Weighted average shares outstanding - diluted (in shares)                         283,837,000 297,798,000 297,259,000
Earnings per unit - basic and diluted (in dollars per share) $ 0.00 $ (0.05) $ (0.07) $ 0.02 $ 0.09 $ 0.09 $ 0.06 $ 0.03 $ 0.13 $ 0.10 $ 0.10 $ 0.06 $ (0.10) $ 0.27 $ 0.39
Antidilutive shares and LTIP units (in shares)                         307,536 416,492 485,865