| Schedule of capitalized terminal, natural gas pipeline, LNG site and related costs | 
        
Property, plant and equipment consists of LNG terminal and natural gas pipeline costs, LNG site and related costs, investments in oil and gas properties, and fixed assets, as follows (in thousands): 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
September 30,  | 
   | 
December 31,  | 
 
   | 
2012  | 
   | 
2011  | 
 
LNG terminal costs  | 
   | 
   | 
   | 
 
LNG terminal  | 
$  | 
1,650,965  | 
 
  | 
   | 
$  | 
1,647,107  | 
 
  | 
 
LNG terminal construction-in-process  | 
966,389  | 
 
  | 
   | 
39,010  | 
 
  | 
 
LNG site and related costs, net  | 
4,976  | 
 
  | 
   | 
4,982  | 
 
  | 
 
Accumulated depreciation  | 
(156,864  | 
)  | 
   | 
(125,108  | 
)  | 
 
Total LNG terminal costs, net  | 
$  | 
2,465,466  | 
 
  | 
   | 
$  | 
1,565,991  | 
 
  | 
 
   | 
   | 
   | 
   | 
 
Natural gas pipeline costs  | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Natural gas pipeline  | 
$  | 
564,027  | 
 
  | 
   | 
$  | 
564,021  | 
 
  | 
 
Natural gas pipeline construction-in-process  | 
2,427  | 
 
  | 
   | 
2,427  | 
 
  | 
 
Pipeline right-of-ways  | 
18,455  | 
 
  | 
   | 
18,455  | 
 
  | 
 
Accumulated depreciation  | 
(64,062  | 
)  | 
   | 
(52,878  | 
)  | 
 
Total natural gas pipeline costs  | 
$  | 
520,847  | 
 
  | 
   | 
$  | 
532,025  | 
 
  | 
 
   | 
   | 
   | 
   | 
 
Oil and gas properties, successful efforts method  | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Proved  | 
$  | 
4,170  | 
 
  | 
   | 
$  | 
4,170  | 
 
  | 
 
Accumulated depreciation, depletion and amortization  | 
(3,179  | 
)  | 
   | 
(3,033  | 
)  | 
 
Total oil and gas properties, net  | 
$  | 
991  | 
 
  | 
   | 
$  | 
1,137  | 
 
  | 
 
   | 
   | 
   | 
   | 
 
Fixed assets  | 
   | 
 
  | 
   | 
   | 
 
  | 
 
Computer and office equipment  | 
$  | 
6,739  | 
 
  | 
   | 
$  | 
5,952  | 
 
  | 
 
Furniture and fixtures  | 
4,057  | 
 
  | 
   | 
4,057  | 
 
  | 
 
Computer software  | 
12,707  | 
 
  | 
   | 
12,601  | 
 
  | 
 
Leasehold improvements  | 
8,732  | 
 
  | 
   | 
7,318  | 
 
  | 
 
Other  | 
2,738  | 
 
  | 
   | 
1,892  | 
 
  | 
 
Accumulated depreciation  | 
(27,225  | 
)  | 
   | 
(23,844  | 
)  | 
 
Total fixed assets, net  | 
$  | 
7,748  | 
 
  | 
   | 
$  | 
7,976  | 
 
  | 
 
Property, plant and equipment, net  | 
$  | 
2,995,052  | 
 
  | 
   | 
$  | 
2,107,129  | 
 
  | 
 
  
 
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