CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
W. P. Carey stockholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	450,000,000	450,000,000
Common stock, shares outstanding (shares)	173,890,427	172,278,242