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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule Of Accumulated Other Comprehensive Loss By Component
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, 2017
$
(19,319
)
 
$
(2,555
)
 
$
338

 
$
(21,536
)
Other comprehensive income (loss)
(11,489
)
 
147

 
—

 
(11,342
)
Balance at June 30, 2018
$
(30,808
)
 
$
(2,408
)
 
$
338

 
$
(32,878
)