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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Stockholders' Equity Attributable to Parent $ 272,005 $ 270,489
Accumulated Translation Adjustment [Member]
   
Stockholders' Equity Attributable to Parent (1,434) (985)
Net current period other comprehensive gain (loss) (449)  
Reclassification of accumulated other comprehensive income (loss) 0  
Accumulated Net Unrealized Investment Gain (Loss) [Member]
   
Stockholders' Equity Attributable to Parent (86) (100)
Net current period other comprehensive gain (loss) 14  
Reclassification of accumulated other comprehensive income (loss) 0  
Accumulated Other Comprehensive Income (Loss) [Member]
   
Stockholders' Equity Attributable to Parent (1,520) (1,085)
Net current period other comprehensive gain (loss) (435)  
Reclassification of accumulated other comprehensive income (loss) $ 0