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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of AOCI, net of tax, were as follows (in thousands):

 
 
Foreign Currency Translation Adjustments
 
Unrealized Gains on Cash Flow Hedges
 
Other Adjustments
 
Total
Balance as of December 31, 2016
 
$
(21,272
)
 
$
—

 
$
—

 
$
(21,272
)
Other comprehensive income (loss) before reclassifications
 
6,694

 
184

 
(16
)
 
6,862

Amounts reclassified from AOCI
 
—

 
(549
)
 
—

 
(549
)
Other comprehensive income (loss)
 
6,694

 
(365
)
 
(16
)
 
6,313

Balance as of December 31, 2017
 
$
(14,578
)
 
$
(365
)
 
$
(16
)
 
$
(14,959
)