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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]  
Comprehensive Income, Policy [Policy Text Block]
Comprehensive Income:

Comprehensive income is the total of net earnings and all other non-owner changes in equity. Comprehensive income for the Company includes net income, foreign currency translation adjustments, cash flow hedging and unrealized gains and losses on marketable securities. The accumulated balances for each component of other comprehensive loss attributable to the Company are as follows:

 
 
2018
 
2017
Currency translation adjustment
 
$
(33,091
)
 
$
(24,798
)
Cash flow hedges, net of tax
 
530

 
(623
)
Unrealized loss on securities, net of tax
 
(67
)
 
(192
)
Accumulated other comprehensive loss
 
$
(32,628
)
 
$
(25,613
)
Investments Classified by Contractual Maturity Date [Table Text Block]
The schedule of maturities at December 31, 2018 and 2017 is as follows:


Maturities as of
December 31, 2018

Maturities as of
December 31, 2017

1 Year or Less

1 to 4 Years

1 Year or Less

1 to 4 Years
Corporate bonds
$
24,617


$
—


$
11,979


$
29,523

Certificates of deposit
42,351


—


52,048


—

Total
$
66,968


$
—


$
64,027


$
29,523