Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ 6,737	$ 7,446
Accumulated amortization, acquired in-place leases, deferred leasing costs, and other intangible assets	1,016,989	772,443
Accumulated amortization, below market leases	$ 219,654	$ 202,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	110,000,000	110,000,000
Preferred stock, shares issued (in shares)	50,650,000	41,900,000
Preferred stock, shares outstanding (in shares)	50,650,000	41,900,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	315,000,000	265,000,000
Common stock, shares issued (in shares)	205,470,300	159,019,118
Common stock, shares outstanding (in shares)	205,470,300	159,019,118
Acquired above-market leases:
Accumulated amortization, acquired above market leases	$ 110,139	$ 87,961
Digital Realty Trust, L.P.
Allowance for doubtful accounts	6,737	7,446
Accumulated amortization, deferred leasing costs and intangible	1,016,989	772,443
Accumulated amortization, below market leases	$ 219,654	$ 202,000
Preferred units, issued (in units)	50,650,000,000	41,900,000,000
Preferred units, outstanding (in units)	50,650,000,000	41,900,000,000
Limited Partners, units outstanding (in units)	8,489,095	2,475,663
Common units, issued (in units)	205,470,300	159,019,118
Common units, outstanding (in units)	205,470,300	159,019,118
Digital Realty Trust, L.P. | Acquired above-market leases:
Accumulated amortization, acquired above market leases	$ 110,139	$ 87,961