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Other Liabilities (Tables)
 6 Months Ended
Jun. 30, 2016
Other Liabilities Disclosure [Abstract]  
Other liabilities
Other liabilities consisted of the following:
(in thousands)
 
As of 
 June 30, 
 2016
 
As of 
 December 31, 
 2015
 
 
 
 
 
Employee compensation and benefits
 
$
18,138

 
$
16,808

Liability for pension benefits
 
225,297

 
221,965

Liabilities for uncertain tax positions
 
3,437

 
3,492

Other
 
20,332

 
25,302

Other liabilities (less current portion)
 
$
267,204

 
$
267,567