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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
June 30,
2017
 
December 31,
2016
Unrealized loss on investments
$
(94
)
 
$
(89
)
Loss on foreign currency translation adjustments
(24,127
)
 
(36,113
)
Total accumulated other comprehensive loss
$
(24,221
)
 
$
(36,202
)