Leases Operating Lease Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Rate
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 47,566
Operating Lease, Liability	51,371
Operating Lease, Cost	$ 1,337
Operating Lease, Weighted Average Remaining Lease Term	16 years 3 months 11 days
Operating Lease, Weighted Average Discount Rate, Percent | Rate	3.49%
Operating Leases, Rent Expense	$ 1,119