Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income (Loss) Attributable to Parent	$ 43,865	$ 25,226	$ 27,015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	44,242	24,694	27,933
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(17)	151	4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	$ 394	$ (683)	$ 914