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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The components of AOCI, on an after-tax basis where applicable, were as follows (in thousands):
 
December 31,
 
2017
 
2016
Foreign currency translation adjustments
$
4,310

 
$
(7,267
)
Unrealized foreign exchange loss on intercompany long-term loans, net of taxes
(1,177
)
 
—

Gain on investments, net of taxes (1)
—

 
276

Actuarial gain (loss)
249

 
(279
)
   Total accumulated other comprehensive income (loss)
$
3,382

 
$
(7,270
)