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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2019
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The changes in the balances of accumulated other comprehensive loss by component are as follows:
(in thousands)
Foreign currency translation adjustment
 
Defined benefit pension plan
 
Liquidation of non-US entity and purchase of non-controlling interests
 
Total
Balance at December 31, 2018
$
(36,669
)
 
$
(2,647
)
 
$
338

 
$
(38,978
)
Other comprehensive income (loss)
1,293

 
116

 
256

 
1,665

Balance at June 30, 2019
$
(35,376
)
 
$
(2,531
)
 
$
594

 
$
(37,313
)