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Related Party Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Related party transactions:    
Management fees revenue $ 5,677 $ 5,161
Revenue from related parties 8,707 8,417
Sac Holdings [Member]
   
Related party transactions:    
Interest income revenue 1,704 1,919
Management fees revenue 4,523 4,074
Private Mini [Member]
   
Related party transactions:    
Interest income revenue 1,326 1,337
Management fees revenue 636 594
Mercury [Member]
   
Related party transactions:    
Management fees revenue $ 518 $ 493