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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive income (loss), net of tax, and other comprehensive income (loss) are summarized as follows (in thousands):
 
Net Unrealized Gains on Marketable Securities
 
Cumulative Translation Adjustment
 
Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2010
$
128

 
$
(162
)
 
$
(34
)
Other comprehensive loss
(370
)
 
(3
)
 
(373
)
Balance at December 31, 2011
(242
)
 
(165
)
 
(407
)
Other comprehensive loss
(647
)
 
165

 
(482
)
Reclassification of Other-Than-Temporary Loss in Marketable Securities
753

 
—

 
753

Balance at December 31, 2012
(136
)
 
—

 
(136
)
Other comprehensive loss
104

 
—

 
104

Balance at December 31, 2013
$
(32
)
 
$
—

 
$
(32
)