Noncontrolling Interest (Narrative) (Details)	12 Months Ended
Dec. 31, 2016 security shares	Dec. 31, 2015	Oct. 31, 2013
Redeemable units conversion ratio \| security	1
Units redeemed for common stock \| shares	120,000
Qualitytech, LP [Member]
Quality Tech LP ownership percentage in operating partnership	12.40%	14.20%	21.20%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant