Subsequent Events (Details) - Subsequent Event [Member]	Jul. 07, 2015 USD ($) a	Jul. 22, 2015 USD ($)
Subsequent Event [Line Items]
Authorized Amount		$ 100,000,000.0
2100 Market Street [Member]
Subsequent Event [Line Items]
Area owned by company of undeveloped parcels of land | a	0.8
Payments to Acquire Land	$ 18,800,000
Amount funded by corporate funds	16,800,000
Amount deferred	$ 2,000,000
Settlement period	24 months