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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of other comprehensive income (loss) [Table Text Block]
The following summarizes the components of other comprehensive income (loss) accumulated in shareholders’ equity for the three months ended March 31, 2018 and three months ended April 1, 2017:
 
 
Foreign
Currency
Translation
Adjustments
 
Defined
Benefit
Pension
Plans
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance at January 1, 2018
 
$
(3,305
)
 
$
(5,088
)
 
$
(8,393
)
Other comprehensive income (loss) before reclassifications
 
 
 
 
 
 
Unrealized losses
 
$
(832
)
 
$
—

 
$
(832
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
—

 
198

 
198

Tax effect
 
—

 
(52
)
 
(52
)
Net of tax amount
 
(832
)
 
146

 
(686
)
Balance at March 31, 2018
 
$
(4,137
)
 
$
(4,942
)
 
$
(9,079
)


 
 
Foreign
Currency
Translation
Adjustments
 
Defined
Benefit
Pension
Plans
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance at January 1, 2017
 
$
(5,500
)
 
$
(6,662
)
 
$
(12,162
)
Other comprehensive income (loss) before reclassifications
 
 
 
 
 
 
Unrealized gains
 
$
322

 
$
—

 
$
322

Amounts reclassified from accumulated other comprehensive income (loss)
 
—

 
253

 
253

Tax effect
 
—

 
(96
)
 
(96
)
Net of tax amount
 
322

 
157

 
479

Balance at April 1, 2017
 
$
(5,178
)
 
$
(6,505
)
 
$
(11,683
)