Leases - Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 34,812	$ 0
Lease liability	$ 37,760	$ 0
Weighted average remaining lease term (in years)	14 years 5 months 5 days
Weighted average discount rate	3.46%