Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flow from operating activities
Net income	$ 38,474	$ 28,852
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	46,235	44,354
Straight line rent	(6,654)	(11,226)
Amortization of deferred financing costs	1,693	1,803
Write off of Deferred Debt Issuance Cost	1,700	0
Amortization of lease contracts above and below market value	(1,195)	(1,832)
Compensation paid with Company common shares	3,515	3,673
Changes in operating assets and liabilities
Rents and other receivables	(3,219)	(566)
Deferred costs	(205)	(787)
Prepaid expenses and other assets	(10,650)	(3,583)
Accounts payable and accrued liabilities	2,260	(2,045)
Accrued interest payable	(254)	56
Prepaid rents and other liabilities	14,087	(110)
Net cash provided by operating activities	85,787	58,589
Cash flow from investing activities
Investments in real estate – development	(20,516)	(35,752)
Interest capitalized for real estate under development	(504)	(1,533)
Improvements to real estate	(4,357)	(1,677)
Additions to non-real estate property	(24)	(55)
Net cash used in investing activities	(25,401)	(39,017)
Cash flow from financing activities
Issuance of preferred stock, net of offering costs	0	62,685
Line of credit:
Proceeds	72,000	15,000
Repayments	(30,000)	(35,000)
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	(138,300)	0
Repayments	(1,300)	(2,600)
Exercises of stock options	0	868
Payments of financing costs	(3,036)	(2,081)
Payments for Repurchase of Common Stock	(37,792)	0
Dividends and distributions:
Common shares	(25,597)	(15,122)
Preferred shares	(13,622)	(12,384)
Redeemable noncontrolling interests – operating partnership	(6,944)	(4,563)
Net cash provided by financing activities	(69,591)	6,803
Net increase (decrease) in cash and cash equivalents	(9,205)	26,375
Cash and cash equivalents, beginning	23,578	14,402
Cash and cash equivalents, ending	14,373	40,777
Supplemental information:
Cash paid for interest	26,200	26,014
Deferred financing costs capitalized for real estate under development	34	97
Construction costs payable capitalized for real estate under development	5,762	14,048
Redemption of operating partnership units	69,900	5,700
Adjustments to redeemable noncontrolling interests – operating partnership	2,111	83,333
DuPont Fabros Technology, L.P. [Member]
Cash flow from operating activities
Net income	38,474	28,852
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	46,235	44,354
Straight line rent	(6,654)	(11,226)
Amortization of deferred financing costs	1,693	1,803
Write off of Deferred Debt Issuance Cost	1,700	0
Amortization of lease contracts above and below market value	(1,195)	(1,832)
Compensation paid with Company common shares	3,515	3,673
Changes in operating assets and liabilities
Rents and other receivables	(3,219)	(566)
Deferred costs	(205)	(787)
Prepaid expenses and other assets	(10,650)	(3,583)
Accounts payable and accrued liabilities	2,260	(2,045)
Accrued interest payable	(254)	56
Prepaid rents and other liabilities	14,087	(110)
Net cash provided by operating activities	85,787	58,589
Cash flow from investing activities
Investments in real estate – development	(20,516)	(35,752)
Interest capitalized for real estate under development	(504)	(1,533)
Improvements to real estate	(4,357)	(1,677)
Additions to non-real estate property	(24)	(55)
Net cash used in investing activities	(25,401)	(39,017)
Cash flow from financing activities
Issuance of preferred stock, net of offering costs	0	62,694
Line of credit:
Proceeds	72,000	15,000
Repayments	(30,000)	(35,000)
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	(138,300)	0
Repayments	(1,300)	(2,600)
Exercises of stock options	0	868
Payments of financing costs	(3,036)	(2,081)
Payments for Repurchase of Common Stock	(37,792)	0
Distributions	(46,163)	(32,069)
Dividends and distributions:
Net cash provided by financing activities	(69,591)	6,812
Net increase (decrease) in cash and cash equivalents	(9,205)	26,384
Cash and cash equivalents, beginning	19,282	10,097
Cash and cash equivalents, ending	10,077	36,481
Supplemental information:
Cash paid for interest	26,200	26,014
Deferred financing costs capitalized for real estate under development	34	97
Construction costs payable capitalized for real estate under development	5,762	14,048
Redemption of operating partnership units	69,900	5,700
Adjustments to redeemable noncontrolling interests – operating partnership	$ 112	$ (81,808)