Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2017
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Expiration date	Dec. 31, 2036
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 339.0
Federal [Member] | Unrestricted [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		152.0
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		224.0
State [Member] | Unrestricted [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 145.0