Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	35.00%	35.00%
Effective income tax rate	32.00%	34.00%	29.00%	23.00%
Consolidated income tax expense (benefit)	$ 21,441	$ 29,797	$ 27,368	$ 22,719
Effective Income Tax Rate Reconciliation excluding European Commission fine [Member]
Income Tax Disclosure [Line Items]
Effective income tax rate				32.00%
Deltafina [Member]
Income Tax Disclosure [Line Items]
Consolidated income tax expense (benefit)		$ 8,000