Real Estate Assets and Construction in Progress (Summary of Properties Owned or Leased by the Company) (Details) $ in Thousands	Mar. 31, 2017 USD ($) facility	Dec. 31, 2016 USD ($) facility
Real Estate Properties [Line Items]
Land	$ 74,130	$ 74,130
Buildings and improvements	1,585,183	1,524,767
Construction in progress	$ 361,021	$ 365,960
Number of facilities leased \| facility	13	13
Other [Member]
Real Estate Properties [Line Items]
Land		$ 4,113
Buildings and improvements		37,810
Construction in progress		6,283
Total cost		48,206
Owned Properties [Member]
Real Estate Properties [Line Items]
Land	$ 74,130	74,130
Buildings and improvements	1,585,183	1,524,767
Construction in progress	361,021	365,960
Total cost	2,020,334	1,964,857
Owned Properties [Member] \| Atlanta, Georgia (Atlanta-Metro) [Member]
Real Estate Properties [Line Items]
Land	15,397	15,397
Buildings and improvements	435,409	434,965
Construction in progress	35,317	32,422
Total cost	486,123	482,784
Owned Properties [Member] \| Richmond, Virginia [Member]
Real Estate Properties [Line Items]
Land	2,180	2,180
Buildings and improvements	237,765	237,347
Construction in progress	72,447	70,580
Total cost	312,392	310,107
Owned Properties [Member] \| Irving Texas [Member]
Real Estate Properties [Line Items]
Land	8,606	8,606
Buildings and improvements	217,178	204,713
Construction in progress	70,435	69,653
Total cost	296,219	282,972
Owned Properties [Member] \| Suwanee, Georgia (Atlanta-Suwanee) [Member]
Real Estate Properties [Line Items]
Land	3,521	3,521
Buildings and improvements	172,416	171,376
Construction in progress	2,169	2,013
Total cost	178,106	176,910
Owned Properties [Member] \| Chicago, Illinois [Member]
Real Estate Properties [Line Items]
Land	9,400	9,400
Buildings and improvements	79,910	45,848
Construction in progress	87,245	100,623
Total cost	176,555	155,871
Owned Properties [Member] \| Piscataway New Jersey [Member]
Real Estate Properties [Line Items]
Land	7,466	7,466
Buildings and improvements	82,424	82,210
Construction in progress	25,381	17,261
Total cost	115,271	106,937
Owned Properties [Member] \| Santa Clara, California [Member]
Real Estate Properties [Line Items]
Buildings and improvements	99,582	98,708
Construction in progress	6,988	7,078
Total cost	106,570	105,786
Owned Properties [Member] \| Sacramento, California [Member]
Real Estate Properties [Line Items]
Land	1,481	1,481
Buildings and improvements	62,147	62,102
Construction in progress	1,430	390
Total cost	65,058	63,973
Owned Properties [Member] \| Princeton, New Jersey [Member]
Real Estate Properties [Line Items]
Land	20,700	20,700
Buildings and improvements	32,765	32,788
Construction in progress	526	538
Total cost	53,991	54,026
Owned Properties [Member] \| Fort Worth, Texas [Member]
Real Estate Properties [Line Items]
Land	136	136
Buildings and improvements	713	610
Construction in progress	50,840	49,116
Total cost	51,689	49,862
Owned Properties [Member] \| Other [Member]
Real Estate Properties [Line Items]
Land	4,113
Buildings and improvements	43,541
Construction in progress	315
Total cost	47,969
Leased Properties [Member] \| Owned Properties [Member]
Real Estate Properties [Line Items]
Land	1,130	1,130
Buildings and improvements	121,333	116,290
Construction in progress	7,928	10,003
Total cost	$ 130,391	$ 127,423

The number of units (items of property) under capital lease arrangements.

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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