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Related Party Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Related party transactions:        
Management fees revenue $ 5,796 $ 5,292 $ 11,473 $ 10,453
Revenue from related parties 8,855 8,374 17,562 16,791
Sac Holdings [Member]
       
Related party transactions:        
Interest income revenue 1,719 1,733 3,423 3,652
Management fees revenue 4,622 4,188 9,145 8,262
Private Mini [Member]
       
Related party transactions:        
Interest income revenue 1,340 1,349 2,666 2,686
Management fees revenue 648 604 1,284 1,198
Mercury [Member]
       
Related party transactions:        
Management fees revenue $ 526 $ 500 $ 1,044 $ 993