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	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Land				$ 7,439	$ 1,130
Buildings, improvements and equipment				78,370	79,372
Construction in process				13,900	12,127
Deferred costs				4,084	532
Other assets				303	737
Deferred income taxes				6,045	19,766
Goodwill			$ 181,738	173,843
Piscataway Facility [Member]
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	1,130
Buildings, improvements and equipment				78,898	79,372
Construction in process				12,127	12,127
Acquired intangibles, net	[1]			108,100	89,847
Net working capital				2,851	2,569
Total identifiable assets acquired				203,106	185,045
Capital lease and lease financing obligations				43,832	43,832
Deferred income taxes				35,980	19,766
Aquired above market lease				2,453
Total liabilities assumed				82,265	63,598
Net identifiable assets acquired				120,841	121,447
Goodwill				173,843	173,237
Net assets acquired				294,684	$ 294,684
Acquired intangible asset adjustment		$ 14,700
Carpathia Hosting, Inc. [Member] | Adjustment [Member]
Business Acquisition [Line Items]
Buildings, improvements and equipment				(474)
Acquired intangibles, net	[1]			18,253
Net working capital				282
Total identifiable assets acquired				18,061
Deferred income taxes				16,214
Aquired above market lease				2,453
Total liabilities assumed				18,667
Net identifiable assets acquired				(606)
Goodwill				$ 606
Tenant Relationship [Member]
Business Acquisition [Line Items]
Amortization adjustment		(1,000)	(700)
Tenant Relationship [Member] | Carpathia Hosting, Inc. [Member]
Business Acquisition [Line Items]
Amortization adjustment		$ (1,000)	$ (700)

[1] During the three months ended March 31, 2016, a $14.7 million adjustment was recorded to increase acquired intangible assets following identified purchase price allocation adjustments, with a corresponding decrease to goodwill. An adjustment of $1.0 million to increase amortization expense related to this increase in acquired intangibles was recorded during the three months ended March 31, 2016, of which $0.7 million related to prior reporting periods.