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Other Non-Current Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]  
Other Non-Current Liabilities

15.  Other Non-Current Liabilities

The composition of other non-current liabilities was as follows:

 

 

 

December 31

 

(In thousands)

 

2017

 

 

2016

 

Deferred revenue

 

$

1,539

 

 

$

1,863

 

Environmental and legal matters

 

 

21,888

 

 

 

22,703

 

Deferred compensation liability

 

 

51,890

 

 

 

53,133

 

Pension liability

 

 

25,632

 

 

 

29,494

 

Other non-current liabilities

 

 

29,484

 

 

 

12,160

 

Total other non-current liabilities

 

$

130,433

 

 

$

119,353