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Condensed Consolidated Statements of Operations Parenthetical (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Depreciation:        
Net gain on sale of real and personal property $ (21,541,000) $ (9,311,000) $ (44,500,000) $ (20,876,000)
Related party:        
Related party revenues, net of eliminations 8,900,000 8,400,000 17,600,000 16,800,000
Related party, costs and expenses, net of eliminations $ 16,400,000 $ 15,900,000 $ 31,400,000 $ 29,900,000