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Variable Interest Entities Nonconsolidated VIEs (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2016
USD ($)
joint_venture
Mar. 31, 2015
USD ($)
Variable Interest Entity [Line Items]    
Number of Variable Interest Joint Ventures | joint_venture 7  
Number of Variable Interest Joint Ventures the Company Guarantees Borrowings On | joint_venture 2  
Investment in joint ventures $ 58,259 $ 54,694
Advances to joint ventures 1,920 7,491
Corporate Joint Venture [Member]    
Variable Interest Entity [Line Items]    
Investment in joint ventures 57,243 53,678
Advances to joint ventures 1,920 3,293
Joint venture, maximum loss exposure $ 100,238 $ 105,983