Income Taxes (Schedule Of Significant Components Of Provision For Income Taxes) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Income Taxes [Abstract]
Current income tax expense (benefit), Federal	[1]	$ (7,846,000)	$ 2,982,000		$ 481,000
Current income tax expense (benefit), State		775,000	675,000		516,000
Current income tax expense (benefit), Foreign		7,079,000	4,685,000		3,120,000
Total current income tax expense (benefit)		8,000	8,342,000		4,117,000
Deferred income tax expense (benefit), Federal		3,654,000	(4,197,000)		612,000
Deferred income tax expense (benefit), State		(2,351,000)	(422,000)		(940,000)
Deferred income tax expense (benefit), Foreign		2,026,000	297,000		1,359,000
Total deferred income tax expense (benefit)		3,329,000	(4,322,000)		1,031,000
Total income tax expense (benefit)		3,337,000	$ 4,020,000	[2]	$ 5,148,000	[2]
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.

[2] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).