Commitments And Contingencies (Lease Standard Impact On Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 52,476	$ 60,557
Other assets			$ 365
Accounts payable			196
Operating lease current liabilities	16,626	17,650
Operating lease long-term liabilities	$ 38,314	45,571
Other liabilities			$ 3,240
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		60,557
Other assets		(365)
Accounts payable		(196)
Operating lease current liabilities		17,650
Operating lease long-term liabilities		45,571
Other liabilities		$ (3,240)