Variable Interest Entities Nonconsolidated VIEs (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014
Variable Interest Entity [Line Items]
Investment in joint ventures	$ 54,508	$ 54,694	$ 51,457
Advances to joint ventures	89,285	41,816	76,672
Corporate Joint Venture [Member]
Variable Interest Entity [Line Items]
Investment in joint ventures	53,491	53,678	50,441
Advances to joint ventures	3,796	3,293	8,222
Joint venture, maximum loss exposure	$ 111,622	$ 105,983	$ 137,333