Income Taxes (Operating Loss Carryforwards) (Details 5) $ in Millions	Dec. 31, 2016 USD ($)
State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	$ 455.6
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	17.6
2017 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	7.3
2017 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	4.1
2018 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	9.3
2018 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	3.6
2019 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	2.8
2019 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	3.3
2020 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	18.3
2020 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	3.3
2021 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	19.6
2021 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	1.1
2022 and after [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	398.3
2022 and after [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	$ 2.2