Basis Of Presentation (Narrative) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Basis of Accounting [Line Items]
Operating lease right of use assets	$ 143,986,000	$ 152,978,000	$ 60,325,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]			Other assets
Operating lease liabilities	$ 155,440,000	160,387,000	$ 66,551,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]			Other liabilities
Retained Earnings [Member]
Basis of Accounting [Line Items]
Change to beginning balance due to adoption of Accounting Standards Update 2016-03		$ 907,000		$ 0