Annual report pursuant to Section 13 and 15(d)

Leases (Details)

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Leases (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2011
acre
Dec. 31, 2010
Dec. 31, 2009
Feb. 28, 2005
acre
Dec. 31, 2011
Houston office lease [Member]
Dec. 31, 2011
Tug boat [Member]
Jan. 31, 2008
Tug boat [Member]
Rate
Jan. 31, 2005
LNG Site Lease [Member]
lease
Rate
Dec. 31, 2011
LNG Site Lease [Member]
lease
Dec. 31, 2011
LNG Site Lease [Member]
Dec. 31, 2010
LNG Site Lease [Member]
Dec. 31, 2009
LNG Site Lease [Member]
Dec. 31, 2005
LNG Site Lease [Member]
Operating Leased Assets [Line Items]                          
Operating Leases, Rent Expense $ 11,500,000 $ 10,200,000 $ 11,300,000             $ 1,800,000 $ 1,700,000 $ 1,500,000  
Operating Leases, Future Minimum Payments Due [Abstract]                          
2012 14,046,000 [1],[2]                        
2013 14,242,000 [1],[2]                        
2014 13,188,000 [1],[2]                        
2015 12,764,000 [1],[2]                        
2016 12,837,000 [1],[2]                        
Thereafter (1) 260,195,000 [1],[2],[3]                        
Total 327,272,000 [1],[2]                        
Houston office contingent sublease revenue         3,400,000                
Operating Leases, Future Minimum Paymets Offset, Receivable from Affiliates           80,200,000              
Ratio of lease payment obligations offset           66.67%              
Initial Term of Lease             10 years 30 years          
Number of available lease extensions             2 6          
Term of available extension             5 years 10 years          
Acreage under lease 1,015     853                  
Operating Leasees, Annual Payments                         1,500,000
Operating Leases, Annual Payments, Increase (Decrease)                   $ 400,000      
Number of Land Leases               3 2        
Lease adjustment period due to inflation                 5 years 5 years      
[1] Future annual minimum lease payments do not include $3.4 million expected to be recovered through sublease agreements for our office leases in Houston, Texas.
[2] Lease payments for our tug boat lease represent third-party tug boat lease payment obligations and do not take into account the payments we receive from our third-party TUA customers that effectively offset $80.2 million, or two-thirds of our lease payment obligations, as discussed below.
[3] Includes certain lease option renewals as they were reasonably assured.