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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]  
Net Changes In Components Of Operating Assets And Liabilities
The following table provides information regarding the net changes in components of operating assets and liabilities:
 
 
Year Ended December 31,
 
2015
 
2014
 
2013
(Increase) decrease in:
 
 
 
 
 
Accounts receivable
$
99,384

 
$
95,014

 
$
(96,300
)
Inventories
3,811

 
38,501

 
1,720

Deferred charges
(11,916
)
 
(8,935
)
 
—

Other current assets
6,417

 
62,305

 
(39,170
)
Increase (decrease) in:
 
 
 
 
 
Accounts payable
(101,581
)
 
(73,307
)
 
41,718

Accrued liabilities
9,257

 
(35,624
)
 
45,846

Net changes in components of operating assets and liabilities
$
5,372

 
$
77,954

 
$
(46,186
)