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Capital - Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 28,720 | $ 26,784 | $ 18,930 | $ 9,856 | $ 39,781 | $ 29,230 | $ 30,184 | $ 18,058 | $ 32,260 | $ 35,489 | $ 31,359 | $ 19,145 | $ 84,290 | $ 117,253 | $ 118,253
Private perpetual preferred unit distributions |  |  |  |  |  |  |  |  |  |  |  |  | (1,743) | (936) | (936)
Earnings allocated to unvested shares |  |  |  |  |  |  |  |  |  |  |  |  | (885) | (851) | (760)
Net income attributable to common unitholders - basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 81,662 | $ 115,466 | $ 116,557
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average units outstanding - basic and diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 297,798,000 | 297,258,000 | 296,455,000
Effect of dilutive securities, stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,000 | 775,000
Effect of dilutive securities, exchangeable senior notes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 819,000
Weighted average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 297,798,000 | 297,259,000 | 298,049,000
Earnings per unit - basic and diluted (in dollars per share) | $ 0.09 | $ 0.09 | $ 0.06 | $ 0.03 | $ 0.13 | $ 0.10 | $ 0.10 | $ 0.06 | $ 0.11 | $ 0.12 | $ 0.10 | $ 0.06 | $ 0.27 | $ 0.39 | $ 0.39
Antidilutive shares and LTIP units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 416,492 | 485,865 | 834,267

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