CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 13,753	$ 11,554
Accumulated amortization, deferred leasing costs and intangibles	1,629,117	1,355,013
Accumulated amortization, below market leases	$ 247,735	$ 242,422
Preferred stock, par value (in dollars per share/unit)	$ 0.01	$ 0.01
Preferred stock, authorized (shares)	110,000,000	110,000,000
Preferred stock, issued (shares)	58,250,000	50,650,000
Preferred stock, outstanding (shares)	58,250,000	50,650,000
Common stock, par value (in dollars per share/unit)	$ 0.01	$ 0.01
Common stock, authorized (shares)	315,000,000	315,000,000
Common stock, shares, issued (shares)	208,900,758	206,425,656
Common stock, shares, outstanding (shares)	208,900,758	206,425,656
Liquidation preference	$ 1,456,250
Preferred stock, liquidation preference per share (in dollars per share)	$ 25.00	$ 25.00
Acquired above-market leases
Accumulated amortization, above market leases	$ 204,233	$ 158,037
Digital Realty Trust, L.P.
Allowance for doubtful accounts	13,753	11,554
Accumulated amortization, deferred leasing costs and intangibles	1,629,117	1,355,013
Accumulated amortization, below market leases	$ 247,735	$ 242,422
Preferred stock, outstanding (shares)		50,650,000
Preferred units, issued (units)	58,250,000	50,650,000
Preferred units, outstanding (units)	58,250,000
Common units, issued (units)	208,900,758	206,425,656
Common units, outstanding (units)	208,900,758	206,425,656
Limited Partners' units, issued (units)	8,843,155	10,580,884
Limited Partners' units outstanding (units)	8,843,155	10,580,884
Digital Realty Trust, L.P. | Acquired above-market leases
Accumulated amortization, above market leases	$ 204,233	$ 158,037