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Other Noncurrent Liabilities
 12 Months Ended
Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]  
Other Noncurrent Liabilities
Other Noncurrent Liabilities:
Other noncurrent liabilities consist of the following at December 31, 2015 and 2014 (in thousands):
 
December 31,
 
2015
 
2014
Liabilities related to uncertain tax positions(a)
$
101,677

 
$
25,340

Executive deferred compensation plan obligation
21,631

 
22,168

Environmental liabilities(b)
33,805

 
4,841

Asset retirement obligations(b)
37,230

 
15,085

Other
60,483

 
20,271

Total
$
254,826

 
$
87,705

(a)
See Note 20, “Income Taxes.”
(b)
See Note 17, “Commitments and Contingencies.”