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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Loss [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables represent changes in accumulated other comprehensive loss by component:
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Balance at March 31, 2017
$
(22,227
)
 
$
(10,309
)
 
$
(32,536
)
Other comprehensive income
11,443

 
—

 
11,443

Amounts reclassified from accumulated other comprehensive loss, net of income taxes of $109 (1)
—

 
201

 
201

Net current-period other comprehensive income, net of taxes
11,443

 
201

 
11,644

Balance at June 30, 2017
$
(10,784
)
 
$
(10,108
)
 
$
(20,892
)
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Balance at March 31, 2016
$
(6,283
)
 
$
(12,141
)
 
$
(18,424
)
Other comprehensive loss
(6,223
)
 
—

 
(6,223
)
Amounts reclassified from accumulated other comprehensive loss, net of income taxes of $135 (1)
—

 
249

 
249

Net current-period other comprehensive (loss) income, net of taxes
(6,223
)
 
249

 
(5,974
)
Balance at June 30, 2016
$
(12,506
)
 
$
(11,892
)
 
$
(24,398
)
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Balance at December 31, 2016
$
(24,701
)
 
$
(10,511
)
 
$
(35,212
)
Other comprehensive income
13,917

 
—

 
13,917

Amounts reclassified from accumulated other comprehensive loss, net of income taxes of $217 (2)
—

 
403

 
403

Net current-period other comprehensive income, net of taxes
13,917

 
403

 
14,320

Balance at June 30, 2017
$
(10,784
)
 
$
(10,108
)
 
$
(20,892
)
 
Foreign currency translation adjustments
 
Pension liability adjustments, net of taxes
 
Accumulated other comprehensive loss
Balance at December 31, 2015
$
(12,513
)
 
$
(12,391
)
 
$
(24,904
)
Other comprehensive income
7

 
—

 
7

Amounts reclassified from accumulated other comprehensive loss, net of income taxes of $269 (2)
—

 
499

 
499

Net current-period other comprehensive income, net of taxes
7

 
499

 
506

Balance at June 30, 2016
$
(12,506
)
 
$
(11,892
)
 
$
(24,398
)