Commitments and Contingencies (Details ) $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2015 USD ($) ft²	Sep. 30, 2015 USD ($)
Commitments and Contingencies.
Development Costs, Cumulative	$ 30.0
Capital Expenditures Incurred but Not yet Paid	$ 10.9
Area of Land | ft²	136,580
Other expenses
Open commitments related to construction contracts		$ 54.7
Open commitments related to telecommunications contracts		11.3
Estimated litigation liability		1.1
Minimum
Other expenses
Estimated litigation liability		0.0
Maximum
Other expenses
Estimated litigation liability		$ 2.0
Pending Litigation
Commitments and Contingencies.
Alleged losses		$70,080,000
Loss contingency, damages sought		$802,564