Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Real Estate [Abstract]
Total lease expense	$ 4,343	$ 3,947	$ 12,764	$ 11,351
Operating cash flows for operating leases			10,134	9,132
ROU asset obtained in exchange for new lease liability, operating leases			$ 4,084	$ 0
Weighted average remaining lease term, operating leases	51 years		51 years
Weighted average discount rate, operating leases	4.36%		4.36%