CONDENSED CONSOLIDATED FINANCIAL STATEMENTS STATEMENTS OF CASH FLOW (UNAUDITED) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash flow from operating activities:
Net income	$ 24,685	$ 24,129	$ 19,103
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	121,464	83,488	55,327
Amortization of deferred loan costs	3,285	3,181	2,673
Amortization of senior notes discount	261	247	98
Equity-based compensation expense	10,584	6,964	4,153
Bad debt expense	1,752	1,323	600
Write off of deferred loan costs	224	468	870
Deferred tax benefit	(10,171)	(10,065)
Loss on sale of property		164
Non-cash integration costs	1,927	3,117
Changes in operating assets and liabilities
Rents and other receivables, net	(17,101)	(1,138)	(1,745)
Prepaid expenses	158	(2,182)	(1,266)
Other assets	(561)	(5,016)	(73)
Accounts payable and accrued liabilities	6,290	8,938	(8,663)
Advance rents, security deposits and other liabilities	5,959	(763)	41
Deferred income	5,038	(3,597)	2,639
Net cash provided by operating activities	153,794	109,258	73,757
Cash flow from investing activities:
Proceeds from sale of property		648
Acquisitions, net of cash acquired	(173,067)	(292,685)	(91,064)
Additions to property and equipment	(279,905)	(320,058)	(201,145)
Net cash used in investing activities	(452,972)	(612,095)	(292,209)
Cash flow from financing activities:
Credit facility proceeds	574,000	671,162	270,500
Senior Notes proceeds			297,633
Debt repayment	(459,002)	(386,998)	(290,000)
Payment of deferred financing costs	(4,177)	(3,649)	(9,864)
Payment of cash dividends	(62,585)	(45,892)	(32,198)
Distribution to noncontrolling interests	(9,619)	(8,865)	(9,049)
Payments to net settle equity awards	1,726
Principal payments on capital lease obligations	(12,600)	(7,677)	(753)
Mortgage principal debt repayments		(86,600)	(2,239)
Equity proceeds, net of costs	275,663	369,372
Net cash provided by financing activities	299,954	500,853	224,030
Net (decrease) increase in cash and cash equivalents	776	(1,984)	5,578
Cash and cash equivalents, beginning of period	8,804	10,788	5,210
Cash and cash equivalents, end of period	9,580	8,804	10,788
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest (excluding deferred financing costs and amounts capitalized)	19,897	18,027	4,950
Noncash investing and financing activities:
Accrued capital additions	40,431	52,552	39,129
Accrued deferred financing costs	39	1	2,858
Accrued equity issuance costs		57
Capital lease and lease financing obligations assumed		43,832
Acquisitions, net of cash acquired:
Land	7,602	3,030	17,976
Buildings, improvements and equipment	80,975	80,818	35,865
Construction in process	62,884	12,127	17,764
Rents and other receivables, net	(2,042)	13,704
Acquired intangibles	34,521	93,400	16,114
Deferred costs	4,414		3,345
Prepaid expenses	574	1,653
Goodwill	(7,895)	174,697
Other assets	309	633
Capital lease and lease financing obligations		(43,832)
Accounts payable and accrued liabilities	(922)	(8,586)
Advance rents, security deposits and other liabilities	(1,343)	(2,468)
Deferred income	35	(10,818)
Deferred income taxes	(6,045)	(21,673)
Total acquisitions, net of cash acquired	173,067	292,685	91,064
Qualitytech, LP [Member]
Cash flow from operating activities:
Net income	24,685	24,129	19,103
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	121,464	83,488	55,327
Amortization of deferred loan costs	3,285	3,181	2,673
Amortization of senior notes discount	261	247	98
Equity-based compensation expense	10,584	6,964	4,153
Bad debt expense	1,752	1,323	600
Write off of deferred loan costs	224	468	870
Deferred tax benefit	(10,171)	(10,065)
Loss on sale of property		164
Non-cash integration costs	1,927	3,117
Changes in operating assets and liabilities
Rents and other receivables, net	(17,101)	(1,138)	(1,745)
Prepaid expenses	158	(2,182)	(1,266)
Other assets	(561)	(5,016)	(73)
Accounts payable and accrued liabilities	6,290	8,938	(8,663)
Advance rents, security deposits and other liabilities	5,959	(763)	41
Deferred income	5,038	(3,597)	2,639
Net cash provided by operating activities	153,794	109,258	73,757
Cash flow from investing activities:
Proceeds from sale of property		648
Acquisitions, net of cash acquired	(173,067)	(292,685)	(91,064)
Additions to property and equipment	(279,905)	(320,058)	(201,145)
Net cash used in investing activities	(452,972)	(612,095)	(292,209)
Cash flow from financing activities:
Credit facility proceeds	574,000	671,162	270,500
Senior Notes proceeds			297,633
Debt repayment	(459,002)	(386,998)	(290,000)
Payment of deferred financing costs	(4,177)	(3,649)	(9,864)
Payment of cash dividends	(62,585)	(45,892)	(32,198)
Partnership distributions	(9,619)	(8,865)	(9,049)
Payments to net settle equity awards	1,726
Principal payments on capital lease obligations	(12,600)	(7,677)	(753)
Mortgage principal debt repayments		(86,600)	(2,239)
Equity proceeds, net of costs	275,663	369,372
Net cash provided by financing activities	299,954	500,853	224,030
Net (decrease) increase in cash and cash equivalents	776	(1,984)	5,578
Cash and cash equivalents, beginning of period	8,804	10,788	5,210
Cash and cash equivalents, end of period	9,580	8,804	10,788
Acquisitions, net of cash acquired:
Total acquisitions, net of cash acquired	$ 173,067	$ 292,685	$ 91,064