Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Federal
Net operating loss carryforwards
Net operating loss carryforwards	$ 274,331
Net operating loss carryforward that can be carried forward indefinitely	148,250	$ 148,250
State
Net operating loss carryforwards
Net operating loss carryforwards	$ 219,375