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Earnings per Share and Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share Basic [Line Items]        
Weighted average common shares/units outstanding for basic EPS/EPU 167,536,000 169,424,000 167,488,000 170,056,000
Weighted average common shares/units outstanding for diluted EPS/EPU 167,962,000 169,682,000 167,877,000 170,291,000
Income per common share - basic $ 0.31 $ 0.28 $ 0.85 $ 0.59
Income per common share - diluted $ 0.31 $ 0.28 $ 0.85 $ 0.59
Weighted Average Limited Partnership Units Outstanding, Basic 349,902 349,902 349,902 349,902
Partnership Interest [Member]        
Earnings Per Share Basic [Line Items]        
Weighted average common shares/units outstanding for basic EPS/EPU 167,886,000 169,774,000 167,838,000 170,406,000
Weighted average common shares/units outstanding for diluted EPS/EPU 168,312,000 170,032,000 168,227,000 170,641,000
Income per common unit - basic $ 0.31 $ 0.28 $ 0.85 $ 0.59
Income per common unit - diluted $ 0.31 $ 0.28 $ 0.85 $ 0.59
Continuing Operations [Member]        
Earnings Per Share Basic [Line Items]        
Income from operations attributable to common stockholders/unit holders - basic $ 51,728 $ 47,841 $ 142,174 $ 100,500
Income from operations attributable to common stockholders/unit holders - diluted 51,728 47,841 142,174 100,500
Continuing Operations [Member] | Partnership Interest [Member]        
Earnings Per Share Basic [Line Items]        
Income from operations attributable to common stockholders/unit holders - basic 51,837 47,941 142,473 100,712
Income from operations attributable to common stockholders/unit holders - diluted $ 51,837 $ 47,941 $ 142,473 $ 100,712