Variable Interest Entities Nonconsolidated VIEs (Details) $ in Thousands	9 Months Ended
	Dec. 31, 2015 USD ($) joint_venture	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items]
Investment in joint ventures	$ 57,698	$ 54,694	$ 54,299
Advances to joint ventures	$ 81,837	41,816	63,491
Corporate Joint Venture [Member]
Variable Interest Entity [Line Items]
Number of joint ventures | joint_venture	7
Investment in joint ventures	$ 56,682	53,678	53,282
Advances to joint ventures	$ 3,484	3,293	4,728
Number of joint venture, maximum loss exposure | joint_venture	2
Joint venture, maximum loss exposure	$ 95,486	$ 105,983	$ 111,065