Income Taxes - Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Federal
Operating Loss Carryforwards
NOL carryforwards	$ 106.5
State
Operating Loss Carryforwards
NOL carryforwards	$ 264.9
Maximum | Federal
Operating Loss Carryforwards
NOL carryforward period of use	20 years
Maximum | State
Operating Loss Carryforwards
NOL carryforward period of use	20 years
Minimum | State
Operating Loss Carryforwards
NOL carryforward period of use	5 years