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Investments (Details) (USD $)
9 Months Ended 1 Months Ended 6 Months Ended 9 Months Ended 15 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Jun. 30, 2011
WMES
item
Dec. 31, 2011
WMES
Sep. 30, 2012
WMES
item
Sep. 30, 2012
WMES
item
May 25, 2011
WMES
Sep. 30, 2012
WMES
JA Mitsui Leasing, Ltd
Sep. 30, 2012
WMES
BOT Lease Co., Ltd.
Dec. 31, 2005
WOLF
item
Sep. 30, 2012
WOLF
Dec. 31, 2011
WOLF
Sep. 30, 2011
WOLF
Sep. 30, 2012
WOLF
Minimum
Sep. 30, 2012
WOLF
Maximum
Investments                                
Ownership interest (as a percent)           50.00% 50.00%         50.00%        
Initial capital contribution               $ 8,000,000                
Additional capital contributions 3,830,000 8,943,000     1,000,000 3,830,000                    
Number of V2500 engines transfer to joint venture       7                        
Number of engines purchased             6                  
Number of engines in lease portfolio           13                    
Capital contributions to date           12,800,000 12,800,000                  
Proportionate gain on sale of engines to joint venture interest which is off-set against investments           3,600,000                    
Net investment after deducting partial offset           9,400,000 9,400,000                  
Gain on sale of engines           7,200,000                    
Credit facility established by equity method investee           8,000,000 8,000,000   180,000,000              
Reference rate, description one-month LIBOR one-month LIBOR                   one-month LIBOR        
Margin (as a percent)                             1.00% 2.50%
Maturity term                   7 years            
Investment in joint venture 19,540,000   15,239,000   5,376,000 9,421,000 9,421,000         10,119,000 9,863,000 9,800,000    
Number of Airbus A340-313 aircraft purchased                     2          
Purchase price of aircraft                     96,000,000          
Number of term notes held                     4          
Number of financial institutions associated with funding of term notes                     1          
Loan for purchase of aircraft                     $ 76,800,000