Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Subsequent Events (Narrative) (Details) - $ / shares				3 Months Ended				6 Months Ended
Subsequent Events (Narrative) (Details) - $ / shares	Aug. 06, 2015	Jul. 08, 2015	Jul. 08, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015
Subsequent Event [Line Items]
Dividend paid to common stockholders				$ 0.32	$ 0.29	$ 0.29	$ 0.24
Dividends payable, date payable				Apr. 07, 2015	Jan. 07, 2015	Apr. 08, 2014	Jan. 07, 2014
Qualitytech, LP [Member]
Subsequent Event [Line Items]
Dividends payable, date of record								Jun. 19, 2015
Subsequent Event [Member] \| Qualitytech, LP [Member]
Subsequent Event [Line Items]
Dividend paid to common stockholders			$ 0.32
Cash dividend payable per common share	$ 0.32
Dividends payable, date declared	Aug. 06, 2015
Dividends payable, date of record	Sep. 18, 2015
Dividends payable, date payable	Oct. 06, 2015	Jul. 08, 2015