Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Current income tax expense (benefit), Federal	[1]	$ 239,000	$ 297,000	$ (7,846,000)
Current income tax expense (benefit), State		391,000	382,000	775,000
Current income tax expense (benefit), Foreign		5,648,000	6,158,000	7,079,000
Total current income tax expense (benefit)		6,278,000	6,837,000	8,000
Deferred income tax expense (benefit), Federal		17,277,000	(3,991,000)	3,567,000
Deferred income tax expense (benefit), State		6,204,000	22,000	(2,351,000)
Deferred income tax expense (benefit), Foreign		(922,000)	430,000	2,069,000
Total deferred income tax expense (benefit)		22,559,000	(3,539,000)	3,285,000
Total income tax expense (benefit)		$ 28,837,000	$ 3,298,000	3,293,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Unrecognzied tax benefits and related interest				$ 7,785

[1] The 2017 amount includes a federal tax benefit of $7,785 related to changes in unrecognized tax benefits and related interest.