Earnings Per Share , Calculation of Numerator and Denominator (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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 awards	691	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	0	0	0	128
Dilutive Securities, Effect on Basic Earnings Per Share, Common Equity	0	0	3,142	0
Diluted earnings - Net income attributable to common stockholders after allocation to restricted stock awards	$ 110,079	$ 58,570	$ 137,865	$ 42,824
Denominator
Weighted average common shares outstanding	112,082,000	95,859,000	110,007,000	94,134,000
Add: dilutive stock options	0	1,000	0	1,000
Add: dilutive restricted stock	0	0	0	390,000
Incremental Common Shares Attributable to Dilutive Effect of Common Equity	0	0	2,586,000	0
Diluted weighted average common shares and securities	112,082,000	95,860,000	112,593,000	94,525,000
Earnings Per Share, Basic	$ 0.98	$ 0.61	$ 1.22	$ 0.45
Earnings Per Share, Diluted	$ 0.98	$ 0.61	$ 1.22	$ 0.45