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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investments        
Earnings from joint ventures $ 245 $ 3,382 $ 551 $ 3,475
Willis Mitsui And Company Engine Support Limited [Member]
       
Investments        
Investment in WMES joint venture at beginning of the period     23,485  
Earnings from joint ventures     551  
Investment in WMES joint venture at end of the period $ 24,036   $ 24,036