Income Taxes - Narrative (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Federal and State Tax Authority
Operating Loss Carryforwards [Line Items]
Federal and state capital loss carryforward	$ 24,600
Federal Tax Authority
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	8,000
Federal Tax Authority | Expire in 2024
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	3,600
Federal Tax Authority | Expire in 2025
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	4,400
State Tax Authority
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	10,100
State Tax Authority | Expire in 2024
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	3,600
State Tax Authority | Expire in 2025
Operating Loss Carryforwards [Line Items]
Federal and state income tax net operating loss carryforward	$ 6,500