Geographic Information and Concentration of Risk (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net Sales
Net domestic sales	$ 53,204	$ 58,278	$ 106,151	$ 115,266
Net foreign sales (Australia and United Kingdom)	2,266	2,014	4,547	4,862
Total net sales	55,470	60,292	110,698	120,128
Assets
Domestic assets	183,615		183,615		186,424
Foreign assets (Australia and United Kingdom)	4,896		4,896		6,422
Total assets	$ 188,511		$ 188,511		$ 192,846