Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Statements of Comprehensive Income
Translation adjustment, tax benefit (expense) (in dollars)	$ (20)	$ 2	$ 3	$ (2)	$ 1