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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
Computations of basic and diluted earnings per share were as follows (in thousands, except per share data):

Three Months EndedSix Months Ended
June 30, 2021June 30, 2020June 30, 2021June 30, 2020
Numerator
Net Income Attributable to Sun Communities, Inc. Common Stockholders$110,770 $58,910 $135,552 $42,824 
Less: allocation to restricted stock awards691 340 829 128 
Basic earnings - Net Income attributable to common stockholders after allocation to restricted stock awards$110,079 $58,570 $134,723 $42,696 
Add: allocation to restricted stock awards— — — 128 
Add: allocation to common equity— — 3,142 — 
Diluted earnings - Net Income attributable to common stockholders after allocation to restricted stock awards(1)
$110,079 $58,570 $137,865 $42,824 
Denominator    
Weighted average common shares outstanding112,082 95,859 110,007 94,134 
Add: dilutive stock options— 1 — 1 
Add: dilutive restricted stock— — — 390 
Add: common equity— — 2,586 — 
Diluted weighted average common shares and securities(1)
112,082 95,860 112,593 94,525 
Earnings Per Share Available to Common Stockholders After Allocation    
Basic earnings per share$0.98 $0.61 $1.22 $0.45 
Diluted earnings per share(1)
$0.98 $0.61 $1.22 $0.45 
(1) For the three and six months ended June 30, 2021, and the three months ended June 30, 2020, diluted earnings per share was calculated using the two-class method as the application of this method resulted in a more dilutive earnings per share for those periods.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] The following table presents the outstanding securities that were excluded from the computation of diluted earnings per share as of June 30, 2021 and 2020 (in thousands):
Six Months Ended
June 30, 2021June 30, 2020
Common OP units2,569 
(1)
2,477 
A-1 preferred OP units703 300 
A-3 preferred OP units75 40 
Aspen preferred OP units395 1,284 
Series C preferred OP units340 310 
Series D preferred OP units391 489 
Series E preferred OP units62 90 
Series F preferred OP units56 90 
Series G preferred OP units155 — 
Series H preferred OP units355 — 
Series I preferred OP units562 — 
Series J preferred OP units145 — 
Total Securities5,808 5,080 
(1) For the six months ended June 30, 2021, Common OP units were excluded from the computation of diluted earnings per share because the inclusion of those securities would have been anti-dilutive for the period.