Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flow from operating activities
Net income	$ 16,727	$ 13,358
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	23,039	21,870
Straight line rent	(4,607)	(5,023)
Amortization of deferred financing costs	918	887
Write off of Deferred Debt Issuance Cost	1,700	0
Amortization of lease contracts above and below market value	(598)	(979)
Compensation paid with Company common shares	1,903	2,034
Changes in operating assets and liabilities
Rents and other receivables	(6,360)	(3,129)
Deferred costs	(119)	(175)
Prepaid expenses and other assets	(7,173)	(3,329)
Accounts payable and accrued liabilities	6,299	727
Accrued interest payable	11,446	11,658
Prepaid rents and other liabilities	4,637	2,294
Net cash provided by operating activities	47,812	40,193
Cash flow from investing activities
Investments in real estate – development	(7,340)	(22,410)
Interest capitalized for real estate under development	(210)	(1,155)
Improvements to real estate	(809)	(179)
Additions to non-real estate property	(18)	(54)
Net cash used in investing activities	(8,377)	(23,798)
Cash flow from financing activities
Issuance of preferred stock, net of offering costs	0	62,696
Line of credit:
Proceeds	62,000	15,000
Repayments	(20,000)	(35,000)
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	(138,300)	0
Repayments	(1,300)	(1,300)
Exercises of stock options	0	429
Payments of financing costs	(1,715)	(2,015)
Payments for Repurchase of Common Stock	(37,792)	0
Dividends and distributions:
Common shares	(12,668)	(7,550)
Preferred shares	(6,811)	(5,572)
Redeemable noncontrolling interests – operating partnership	(3,757)	(2,287)
Net cash provided by financing activities	(45,343)	24,401
Net increase (decrease) in cash and cash equivalents	(5,908)	40,796
Cash and cash equivalents, beginning	23,578	14,402
Cash and cash equivalents, ending	17,670	55,198
Supplemental information:
Cash paid for interest	1,700	1,361
Deferred financing costs capitalized for real estate under development	15	76
Construction costs payable capitalized for real estate under development	2,609	7,299
Redemption of operating partnership units	68,900	2,400
Adjustments to redeemable noncontrolling interests – operating partnership	3,011	5,107
DuPont Fabros Technology, L.P. [Member]
Cash flow from operating activities
Net income	16,727	13,358
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	23,039	21,870
Straight line rent	(4,607)	(5,023)
Amortization of deferred financing costs	918	887
Write off of Deferred Debt Issuance Cost	1,700	0
Amortization of lease contracts above and below market value	(598)	(979)
Compensation paid with Company common shares	1,903	2,034
Changes in operating assets and liabilities
Rents and other receivables	(6,360)	(3,129)
Deferred costs	(119)	(175)
Prepaid expenses and other assets	(7,173)	(3,329)
Accounts payable and accrued liabilities	6,299	736
Accrued interest payable	11,446	11,658
Prepaid rents and other liabilities	4,637	2,294
Net cash provided by operating activities	47,812	40,202
Cash flow from investing activities
Investments in real estate – development	(7,340)	(22,410)
Interest capitalized for real estate under development	(210)	(1,155)
Improvements to real estate	(809)	(179)
Additions to non-real estate property	(18)	(54)
Net cash used in investing activities	(8,377)	(23,798)
Cash flow from financing activities
Issuance of preferred stock, net of offering costs	0	62,696
Line of credit:
Proceeds	62,000	15,000
Repayments	(20,000)	(35,000)
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	(138,300)	0
Repayments	(1,300)	(1,300)
Exercises of stock options	0	429
Payments of financing costs	(1,715)	(2,015)
Payments for Repurchase of Common Stock	(37,792)	0
Distributions	(23,236)	(15,409)
Dividends and distributions:
Net cash provided by financing activities	(45,343)	24,401
Net increase (decrease) in cash and cash equivalents	(5,908)	40,805
Cash and cash equivalents, beginning	19,282	10,097
Cash and cash equivalents, ending	13,374	50,902
Supplemental information:
Cash paid for interest	1,700	1,361
Deferred financing costs capitalized for real estate under development	15	76
Construction costs payable capitalized for real estate under development	2,609	7,299
Redemption of operating partnership units	68,900	2,400
Adjustments to redeemable noncontrolling interests – operating partnership	$ (1,797)	$ (4,392)