Segment Reporting And Foreign Operations Foreign Sales (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenue, Net	$ 91,092	$ 90,477	$ 91,249	$ 86,631	$ 81,203	$ 73,172	$ 74,948	$ 67,432	$ 359,449	$ 296,755	$ 257,462
Foreign Sales Percent of Total Sales	35.00%				32.00%				35.00%	32.00%	34.00%
Foreign Sales [Member]
Segment Reporting Information [Line Items]
Revenue, Net									$ 125,900	$ 95,200	$ 86,400