Leases Lease Costs and Other Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lease, Cost [Abstract]
Operating lease cost	$ 3,440,000
Short-term lease cost	14,000
Interest on lease liabilities	62,000
Amortization of right-of-use asset	(56,000)
Sublease income	(249,000)
Net lease cost	3,323,000
Rent expense related to leases		$ 3,200,000
Operating cash flows related to operating leases	3,381,000
Operating cash flows related to finance leases	(62,000)
Financing cash flows related to finance leases	$ 55,000
Weighted average remaining lease term, operating lease	9 years 8 months 27 days
Weighted average remaining lease term, finance lease	9 years 6 months 29 days
Weighted average discount rate, operating lease	3.31%
Weighted average discount rate, finance lease	7.22%