Leases Supplemental Balance Sheet Information (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Supplemental Balance Sheet Information [Abstract]
Operating lease ROU assets	$ 6,217
Operating lease ROU assets, Statement of Financial Position [Extensible List]	us-gaap:PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Operating lease liabilities, current	$ 552
Operating lease liabilities, current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities, noncurrent	$ 5,336
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 5,888
Weighted average remaining lease terms	12 years 2 months 19 days
Weighted average discount rate	4.63%