Leases - Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 32,694	$ 0
Lease liability	$ 35,093	$ 0
Weighted average remaining lease term (in years)	15 years 7 months 24 days
Weighted average discount rate	3.48%