Quarterly Financial Information (Summary of Selected Quarterly Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									9 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Oct. 14, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effect of Fourth Quarter Events [Line Items]
Revenues	$ 92,690	$ 88,890	$ 68,117	$ 61,386	$ 59,563	$ 57,945	$ 51,338	$ 48,943	$ 40,462		$ 311,083	$ 217,789
Operating income	7,243	11,095	7,266	10,379	11,682	9,913	6,266	7,413	6,203		35,983	35,274
Net income	5,334	8,238	5,520	5,037	5,848	4,006	3,921	5,328	4,002	$ (152)	24,129	19,103
Net income available to common stockholders - basic	$ 4,603	$ 7,009	$ 4,632	$ 4,082	$ 4,627	$ 3,157	$ 3,090	$ 4,198	$ 3,154		$ 20,326	$ 15,072
Net income per share attributable to common shares - basic	$ 0.11	$ 0.17	$ 0.13	$ 0.13	$ 0.16	$ 0.11	$ 0.11	$ 0.14	$ 0.11		$ 0.54	$ 0.52
Net income per share attributable to common shares - diluted	$ 0.11	$ 0.17	$ 0.12	$ 0.13	$ 0.16	$ 0.11	$ 0.11	$ 0.14	$ 0.11		$ 0.53	$ 0.51
Qualitytech, LP [Member]
Effect of Fourth Quarter Events [Line Items]
Revenues	$ 92,690	$ 88,890	$ 68,117	$ 61,386	$ 59,563	$ 57,945	$ 51,338	$ 48,943			$ 311,083	$ 217,789	$ 177,887
Operating income	7,243	11,095	7,266	10,379	11,682	9,913	6,266	7,413			35,983	35,274	25,986
Net income	$ 5,334	$ 8,238	$ 5,520	$ 5,037	$ 5,848	$ 4,006	$ 3,921	$ 5,328			$ 24,129	$ 19,103	$ 3,850