Accounting For Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current income tax expense	$ 16,276	$ 17,490	$ 13,101
Deferred income tax expense	15,098	8,570	69,657
Total income tax expense	$ 31,374	$ 26,060	$ 82,758