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Earnings per Share and 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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income attributable to common stockholders/unit holders - basic |  |  |  |  |  |  |  |  | $ 239,430 | $ 249,127 | $ 159,949
Weighted average common shares/units outstanding for basic EPS/EPU |  |  |  |  |  |  |  |  | 167,526,000 | 169,724,000 | 159,536,000
Weighted average common shares/units outstanding for diluted EPS/EPU |  |  |  |  |  |  |  |  | 167,771,000 | 170,100,000 | 159,960,000
Income per common share - basic | $ 0.24 | $ 0.34 | $ 0.31 | $ 0.54 | $ 0.47 | $ 0.41 | $ 0.28 | $ 0.31 | $ 1.43 | $ 1.47 | $ 1.00
Income per common share - diluted | $ 0.24 | $ 0.34 | $ 0.31 | $ 0.54 | $ 0.46 | $ 0.41 | $ 0.28 | $ 0.31 | $ 1.43 | $ 1.46 | $ 1.00
Weighted Average Limited Partnership Units Outstanding, Basic |  |  |  |  |  |  |  |  | 464,286 | 349,902 | 295,054
Partnership Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares/units outstanding for basic EPS/EPU |  |  |  |  |  |  |  |  | 167,990,000 | 170,074,000 | 159,831,000
Weighted average common shares/units outstanding for diluted EPS/EPU |  |  |  |  |  |  |  |  | 168,235,000 | 170,450,000 | 160,255,000
Income per common share - basic |  |  |  |  |  |  |  |  | $ 1.43 | $ 1.47 | $ 1.00
Income per common share - diluted |  |  |  |  |  |  |  |  | $ 1.43 | $ 1.46 | $ 1.00
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income attributable to common stockholders/unit holders - basic |  |  |  |  |  |  |  |  | $ 239,430 | $ 249,127 | $ 159,949
Income attributable to common stockholders/unit holders - diluted |  |  |  |  |  |  |  |  | 239,430 | 249,127 | 159,949
Continuing Operations [Member] | Partnership Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share Basic [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income attributable to common stockholders/unit holders - basic |  |  |  |  |  |  |  |  | 240,064 | 249,652 | 160,337
Income attributable to common stockholders/unit holders - diluted |  |  |  |  |  |  |  |  | $ 240,064 | $ 249,652 | $ 160,337

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