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Variable Interest Entities Nonconsolidated VIEs (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2016
USD ($)
joint_venture
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Variable Interest Entity [Line Items]      
Investment in joint ventures $ 56,637 $ 58,259 $ 54,508
Advances to joint ventures $ 9,266 1,920 7,732
Corporate Joint Venture      
Variable Interest Entity [Line Items]      
Number of joint ventures | joint_venture 7    
Investment in joint ventures $ 55,620 57,243 53,491
Advances to joint ventures $ 9,266 1,920 3,796
Number of joint venture, maximum loss exposure | joint_venture 2    
Joint venture, maximum loss exposure $ 107,009 $ 100,238 $ 111,622