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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Schedule of accumulated other comprehensive income
Accumulated other comprehensive income consisted of the following (in thousands):
 
Foreign Currency Adjustments
 
Unrealized Gains (Losses) on Marketable Securities
 
Total Accumulated Other Comprehensive Income
Balances at December 31, 2012
$
29,730

 
$
(5
)
 
$
29,725

Current period other comprehensive income (loss)
(3,523
)
 
(7
)
 
(3,530
)
Balances at June 30, 2013
$
26,207

 
$
(12
)
 
$
26,195