Acquisitions (Allocation of the Fair Value of Assets Acquired and Liabilities Assumed as of the Acquisition Date) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Land			$ 7,440		$ 1,130
Buildings, improvements and equipment			80,390		78,898
Construction in process			13,900		12,127
Deferred costs			4,391
Other assets			303		633
Capital lease and lease financing obligations					43,832
Deferred income taxes			6,045		$ 21,673
Goodwill		$ 181,738	173,843
Adjusted Fair Value
Business Acquisition [Line Items]
Buildings, improvements and equipment			2,021
Acquired intangibles, net			(2,087)
Deferred costs			307
Total identifiable assets acquired			241
Acquired below market lease			241
Total liabilities assumed			241
Piscataway Facility [Member]
Business Acquisition [Line Items]
Land			7,440
Buildings, improvements and equipment			80,391
Construction in process			13,900
Acquired intangibles, net			19,581
Deferred costs			4,391
Other assets			106
Total identifiable assets acquired			125,809
Acquired below market lease			809
Net working capital			2,019
Total liabilities assumed			2,828
Net identifiable assets acquired			$ 122,981
Piscataway Facility [Member] | Original Allocation Reported
Business Acquisition [Line Items]
Land				$ 7,440
Buildings, improvements and equipment				78,370
Construction in process				13,900
Acquired intangibles, net				21,668
Deferred costs				4,084
Other assets				106
Total identifiable assets acquired				125,568
Acquired below market lease				568
Net working capital				2,019
Total liabilities assumed				2,587
Net identifiable assets acquired				122,981
Carpathia Hosting, Inc. [Member]
Business Acquisition [Line Items]
Land				1,130
Buildings, improvements and equipment				78,898
Construction in process				12,127
Acquired intangibles, net				108,100
Net working capital				2,851
Total identifiable assets acquired				203,106
Capital lease and lease financing obligations				43,832
Deferred income taxes				35,980
Aquired above market lease				2,453
Total liabilities assumed				82,265
Net identifiable assets acquired				120,841
Goodwill				173,843
Net assets acquired				$ 294,684
Tenant Relationship [Member]
Business Acquisition [Line Items]
Amortization adjustment	$ (1,000)	$ (700)