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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated other comprehensive income        
Balance as of January 1, 2015     $ (1,912)  
Other comprehensive income, net of tax $ 741 $ 520 308 $ 703
Balance as of June 30, 2015 (1,604)   (1,604)  
Unrealized gains (losses) on available for sale securities        
Accumulated other comprehensive income        
Balance as of January 1, 2015     (445)  
Other comprehensive income, net of tax     135  
Balance as of June 30, 2015 (310)   (310)  
Foreign currency translation adjustments        
Accumulated other comprehensive income        
Balance as of January 1, 2015     (1,467)  
Other comprehensive income, net of tax     173  
Balance as of June 30, 2015 $ (1,294)   $ (1,294)