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Subsequent Events (Details) - USD ($) $ in Millions		12 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Jul. 29, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Subsidies received		$ 0.3
Subsequent Event [Member]
Subsequent Event [Line Items]
Percent overlap	100.00%
Phase-out period	3 years
Subsequent Event [Member] \| New Jersey Study Area [Member]
Subsequent Event [Line Items]
Percent overlap	100.00%