Income Taxes (Schedule Of Income (Loss) Before Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Income (loss) before income taxes and equity earnings of unconsolidated joint ventures	$ (70,375)	$ 1,542	$ 16,490
Equity earnings (loss) of unconsolidated joint ventures	(449)	792	974
Income (loss) before income taxes	(70,824)	2,334	17,464
United States [Member]
Income Tax Disclosure [Line Items]
Income (loss) before income taxes and equity earnings of unconsolidated joint ventures	(56,709)	(11,539)	(3,493)
Equity earnings (loss) of unconsolidated joint ventures
Foreign [Member]
Income Tax Disclosure [Line Items]
Income (loss) before income taxes and equity earnings of unconsolidated joint ventures	(13,666)	13,081	19,983
Equity earnings (loss) of unconsolidated joint ventures	$ (449)	$ 792	$ 974