Income Taxes - Operating loss carryforwards (Details) $ in Thousands	Sep. 30, 2018 USD ($)
U.S.
Operating loss carryforwards
Operating Loss Carryforwards	$ 68,730
Capital loss carryforwards	37,238
State
Operating loss carryforwards
Operating Loss Carryforwards	50,836
Capital loss carryforwards	54,825
Foreign
Operating loss carryforwards
Operating Loss Carryforwards	$ 9,430