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Capital - Earnings Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net income (loss) $ (13,037) $ (22,889) $ 84,290
Private perpetual preferred unit distributions (4,201) (4,197) (1,743)
Earnings allocated to unvested shares - basic (340) (985) (885)
Earnings allocated to unvested shares - diluted (340) (985) (885)
Net income (loss) attributable to common unitholders - basic (17,578) (28,071) 81,662
Net income (loss) attributable to common unitholders - diluted $ (17,578) $ (28,071) $ 81,662
Denominator:      
Weighted average units outstanding - basic (in shares) 277,420,000 283,826,000 297,798,000
Effect of dilutive securities:      
Stock-based compensation plans (in shares) 0 11,000 0
Weighted average shares outstanding - diluted (in shares) 277,420,000 283,837,000 297,798,000
Earnings Per Share, Basic and Diluted [Abstract]      
Earnings per unit - basic (in dollars per share) $ (0.06) $ (0.10) $ 0.27
Earnings per unit - diluted (in dollars per share) $ (0.06) $ (0.10) $ 0.27
Antidilutive securities (in shares) 1,052,390 307,536 416,492