Acquisition of Real Estate (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Jun. 30, 2014 acre sqft	Jul. 08, 2014 acre sqft
Business Acquisition [Line Items]
Cash consideration paid for acquisition	$ 47,963,000	$ 201,145,000
Princeton Facility [Member]
Business Acquisition [Line Items]
Aggregate costs related to acquisition				73,300,000
Acres of real estate property				194
Area of facility				560,000
Lease period			10 years
Renewal of lease period			15 years
Princeton Facility [Member] | Raised Floor With Twelve MW Gross Power [Member]
Business Acquisition [Line Items]
Area of facility				58,000
Capacity of the plant				12
Chicago Facility [Member]
Business Acquisition [Line Items]
Aggregate costs related to acquisition					$ 18,000,000
Acres of real estate property					30
Area of facility					317,000
Chicago Facility [Member] | Scenario, Plan [Member]
Business Acquisition [Line Items]
Area of facility		400,000	400,000
Chicago Facility [Member] | Raised Floor With Twelve MW Gross Power [Member]
Business Acquisition [Line Items]
Area of facility					133,000
Capacity of the plant					24
Chicago Facility [Member] | Raised Floor With Twelve MW Gross Power [Member] | Scenario, Plan [Member]
Business Acquisition [Line Items]
Area of facility		215,000	215,000
Capacity of the plant		37	37