Leases (Supplemental Balance Sheet Information Related To Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Right-of-use assets	$ 56,043	$ 55,897
Liabilities
Current lease liabilities	7,827	7,661
Long-term lease liabilities	51,751	51,336
Total lease liabilities	$ 59,578	$ 58,997
Weighted-average remaining lease term	12 years 3 months 18 days	12 years 6 months
Weighted-average discount rate	9.28%	9.22%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	OTHER ASSETS	OTHER ASSETS
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent