Summary Of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 232,717
Operating lease, liability	262,139
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	243,700
Operating lease, liability	$ 264,600