Income Taxes Net Operating Loss Carryforwards (Details) - State and Local Jurisdiction [Member] $ in Thousands	Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 4,900
Expiring between 2022 and 2027 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,438
Expiring between 2028 and 2032 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 3,455