Income Taxes (Schedule Of Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current income taxes, U.S. Federal									$ 5,750	$ 5,839	$ 3,554
Current income taxes, State and local									812	600	473
Current income taxes, Foreign									671	444	215
Total current income taxes									7,233	6,883	4,242
Deferred income taxes, U.S. Federal									(2,867)	232	694
Deferred income taxes, State and local									265	(38)	(60)
Deferred income taxes, Foreign									(269)	35	198
Total deferred income taxes									(2,871)	229	832
Total income taxes	$ 1,169	$ 1,030	$ 51	$ 2,112	$ 2,083	$ 1,609	$ 1,402	$ 2,018	$ 4,362	$ 7,112	$ 5,074