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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
December 31, 2016
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Beginning Balance
$
(12,513
)
 
$
(12,391
)
 
$
(24,904
)
Other comprehensive (loss) income before reclassifications, net of taxes of $535
(12,188
)
 
881

 
(11,307
)
Amounts reclassified from accumulated other comprehensive loss, net of taxes of $538(1)
—

 
999

 
999

Net current-period other comprehensive (loss) income, net of taxes
(12,188
)
 
1,880

 
(10,308
)
Ending Balance
$
(24,701
)
 
$
(10,511
)
 
$
(35,212
)
 
December 31, 2015
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Beginning Balance
$
3,808

 
$
(12,494
)
 
$
(8,686
)
Other comprehensive loss before reclassifications, net of taxes of $447
(16,321
)
 
(825
)
 
(17,146
)
Amounts reclassified from accumulated other comprehensive loss, net of taxes of $501 (1)
—

 
928

 
928

Net current-period other comprehensive (loss) income, net of taxes
(16,321
)
 
103

 
(16,218
)
Ending Balance
$
(12,513
)
 
$
(12,391
)
 
$
(24,904
)