Commitments and Contingencies (Details ) $ in Millions	1 Months Ended
	Apr. 30, 2015 USD ($) ft²	Jun. 30, 2015 USD ($)
Commitments and Contingencies
Development Costs, Cumulative	$ 30.0
Capital Expenditures Incurred but Not yet Paid	$ 5.0
Area of Land | ft²	136,580
Other expenses
Open commitments related to construction contracts		$ 14.6
Open commitments related to telecommunications contracts		$ 11.4