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Leases Leases (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Operating Leased Assets [Line Items]    
Rent expense related to operating lease liabilities $ 700 $ 1,500
Operating Lease, Right-of-Use Asset 11,600,000 11,600,000
Operating lease liabilities 16,200,000 16,200,000
Variable lease expense 400 700
Cash flows from operating leases $ 800 $ 1,600
Weighted average remaining lease term (years) 5 years 9 months 18 days 5 years 9 months 18 days
Weighted average discount rate - operating leases (1) 4.90% 4.90%